Last week I was able to tear down a LSC Smart GU10-RGB bulb. My idea was to flash the chip with OpenBK7231T But, the issue is, that when I connect the LSC PCB to GND and 3V3 (coming from the USB->Serial converter), the USB converter starts to Hiccup (like an overloaded switched power supply)....

Hi everyone, Just wanted to confirm a working config for this bulb and use this chance for a BIG BIG THANKS for this project. Before I was just jealousy looking at the huge selection of the much cheaper tuya devices that I couldn't flash with tasmota... now after a steep learning curve flashing over the air works even faster and much more convenient than with tasmota - just awesome! Bought above GU10 bulb today at Action and the package has the barcode ending on 409 (as on the picture above) My config: - Flags: 4, 8, 10, 12, 16 - Startup: all channels -1 (together with flag 12 this makes the bulb power up in the last state) - Startup command text: SM2135_Map 1 2 0 4 3 - Module config: P24 - SM2135DAT, P26 - SM2135CLK During setup I encountered an issue (guess due to sloppiness) that I wanted to share in case someone runs into the same: No matter what device map I configured both sliders (tone and brightness) did pretty random things, moving them a bit could change the color or brightness or tone on the same slider and the rgb picker did nothing at all Eventually I found out that at some point I used SM2235 everywhere instead of SM2135... small but significant difference. After sorting that out the bulb is now happily integrated and works great! .

Hi there, got two of these bulbs in my drawer as spares and I had to use it yesterday.The reference is now 3004919.1 on the package, FW 2.9.29 on BK7231T.I convert using TCC and the main difference is that this bulb is using now SM2235 instead of SM2135.I'm using this conf and everything is working fine :Code: text Expand Select all Copy to clipboard pins: { 24: SM2235DAT;0, 26: SM2235CLK;0 }, command: SM2235_Map 0 1 2 3 4,edit : I'm also using flags 4 & 8.For your info, Action FR is now selling those bulbs by pack of 3 for 12€, I bought one yesterday, REF 3208076 but unfortunately, it seems to be an BK7231N on FW 1.5.32, known as a patched one so no big chance with those bulbs. I will use them on local tuya.

Hi, I made a new post since the 3-Pack / new GU10 bulbs from LSC/Action are a bit different.Hope it helps!

Well, I can see you already have taken good steps towards fixing the issue (removing the capacitor and the diode), but it seems the problem still persists. This is why I always recommend using external reliable LDO. Take a look at my setup here: NOTE: the circuit above assumes you have desoldered WiFi module, but it's basically the same if you just connect 3.3V LDO to the power on the board. Image source: The BK7231 at peak activity can take more than 50mA. I would never attempt to use such weak LDO. You must have lucked out with previous devices. Find any better 3.3V supply (maybe from Arduino? But it's a bit hacky) or just a 3.3V LDO, maybe AMS1117-3.3V (very cheap, can be also found on scrap boards) and try again. EDIT: Look, for example, this user also reports that he needed a better power supply:

Hi, I got also some of that GU10 from Action. I got two different versions. Both with firmware 2.9.16 and both flashed with tuya-cloudcutter with the profil is added for this bulb. Also the configuration is the same with sm2135 on pin 24 SM2135DAT and 26 SM2135CLK. The difference is the barcode on the package and then the mapping in openbeken for the bulbs. This is with SM2135_Map 1 2 0 4 3 and this is with SM2135_Map 1 0 2 4 3 Also added only flag 4 and 8. When I use flag 9 I can't toogle the light to off or on cause colour is always on. Hope this will help others with this GU10.

Thank you, I will add this config to templates database. By the way, here is a flag list, because most of the people don't remember what is what: So you're saying you're using flag 8? Are you sure that it matters for this device? I think that it will also work without flag 8.

I cheked it, and no matter with flag 8.

There is a new version at Action Stores Version 1.1 with firmware 2.9.6. I dumped it and added it to tuyacloudcutter Profile to flash OTA. There are 5 PWM. Pin 7 = channel 5 is warm white, Pin 8 = channel 1 is red, Pin 9 = channel 2 is green, Pin 24 = channel 3 is bluePin 26 = channel 4 and cold white. Like I wrote before seems to be a new version.

Is it a Gu10 version as well? Can you show more photos of the packaging?

Hi, Yesterday I bought two in Action IT and unfortunately there is firmware 1.5.32 ; I'm desperately looking for GU10 bulbs to use with DDP RGBW protocol

more and more devices are patched, maybe we should focus on figuring out the way to flash LEDs via UART without damaging them...

>>21350542 Unfortunately I'm not very familiar with opening light bulbs and I would like to take a lot of them for the whole house

Flashing LSC Smart GU10-RGB Bulb with OpenBK7231T: Overload Issue with USB->Serial Converter

bprosman 7107 19

Best answers

Why does my USB-to-serial adapter overload and hiccup when I power a LSC Smart GU10-RGB bulb’s BK7231T from its 3.3V output while flashing OpenBK7231T?

Your USB-to-serial adapter is likely overloaded because the BK7231 can draw more than 50 mA at peak activity, so its 3.3V output is too weak for this bulb [#20307832] Removing the Schottky diode and 470 µF capacitor was a sensible first step, but it does not solve the current demand [#20307832] Use a separate, reliable 3.3V supply instead, such as an external LDO [#20307832] A cheap AMS1117-3.3V or another stronger regulator should work better than the adapter’s built-in 3.3V pin [#20307832] Once the BK7231 is powered from a proper supply, flashing should be much more stable [#20307832]

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#1 20305933 27 Nov 2022 15:37

bprosman bprosman

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Post #1
20305933 27 Nov 2022 15:37

Last week I was able to tear down a LSC Smart GU10-RGB bulb.
My idea was to flash the chip with OpenBK7231T

But, the issue is, that when I connect the LSC PCB to GND and 3V3 (coming from the USB->Serial converter), the USB converter starts to "Hiccup" (like an overloaded switched power supply). This is already the case when I only connect GND and 3V3, for this I used the point labeled GND and 3V3 on the PCB.

The 3V3 from the USB->Serial converter can supply 50mA so this should be sufficient (I have flashed LSC smart sockets with this).
In an attempt to "Isolate" the BK7231 I have removed the Schottky diode coming from the built-in power supply and the 470uF capacitor.

Any help is welcome. It is a "Virgin device", I did not try an OTA flash (yet).

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#2 20307832 28 Nov 2022 15:57

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #2
20307832 28 Nov 2022 15:57

Well, I can see you already have taken good steps towards fixing the issue (removing the capacitor and the diode), but it seems the problem still persists.
This is why I always recommend using external reliable LDO.
Take a look at my setup here:

NOTE: the circuit above assumes you have desoldered WiFi module, but it's basically the same if you just connect 3.3V LDO to the power on the board.
Image source: https://www.youtube.com/watch?v=7MyfSgxLAOo&ab_channel=elektroda.pl

The BK7231 at peak activity can take more than 50mA. I would never attempt to use such weak LDO. You must have lucked out with previous devices.

Find any better 3.3V supply (maybe from Arduino? But it's a bit hacky) or just a 3.3V LDO, maybe AMS1117-3.3V (very cheap, can be also found on scrap boards) and try again.

EDIT: Look, for example, this user also reports that he needed a better power supply: https://www.elektroda.com/rtvforum/topic3937358.html

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
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#3 20355475 28 Dec 2022 11:35

alfakenzo alfakenzo

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Post #3
20355475 28 Dec 2022 11:35

Hi, I got also some of that GU10 from Action. I got two different versions. Both with firmware 2.9.16 and both flashed with tuya-cloudcutter with the profil is added for this bulb. Also the configuration is the same with sm2135 on pin 24 SM2135DAT and 26 SM2135CLK.
The difference is the barcode on the package and then the mapping in openbeken for the bulbs.

This is with SM2135_Map 1 2 0 4 3

and this is with SM2135_Map 1 0 2 4 3
Also added only flag 4 and 8.
When I use flag 9 I can't toogle the light to off or on cause colour is always on.
Hope this will help others with this GU10.
#4 20357004 29 Dec 2022 01:44

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #4
20357004 29 Dec 2022 01:44

Thank you, I will add this config to templates database. By the way, here is a flag list, because most of the people don't remember what is what:

So you're saying you're using flag 8? Are you sure that it matters for this device? I think that it will also work without flag 8.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#5 20359158 30 Dec 2022 11:05

alfakenzo alfakenzo

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Post #5
20359158 30 Dec 2022 11:05

I cheked it, and no matter with flag 8.
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#6 20372474 07 Jan 2023 11:01

alfakenzo alfakenzo

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Post #6
20372474 07 Jan 2023 11:01

There is a new version at Action Stores Version 1.1 with firmware 2.9.6. I dumped it and added it to tuyacloudcutter Profile to flash OTA.

There are 5 PWM.
Pin 7 = channel 5 is warm white,
Pin 8 = channel 1 is red,
Pin 9 = channel 2 is green,
Pin 24 = channel 3 is blue
Pin 26 = channel 4 and cold white.
Like I wrote before seems to be a new version.
#7 20372666 07 Jan 2023 12:41

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #7
20372666 07 Jan 2023 12:41

alfakenzo wrote:
There is a new version at Action Stores Version 1.1

Is it a Gu10 version as well? Can you show more photos of the packaging?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#8 20372731 07 Jan 2023 13:18

alfakenzo alfakenzo

Level 9

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Post #8
20372731 07 Jan 2023 13:18

Here are some more of them.
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#9 20460367 26 Feb 2023 22:02

jrhenk jrhenk

Level 10

Helpful post? (+2)

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Post #9
20460367 26 Feb 2023 22:02

Hi everyone,
Just wanted to confirm a working config for this bulb and use this chance for a BIG BIG THANKS for this project. Before I was just jealousy looking at the huge selection of the much cheaper tuya devices that I couldn't flash with tasmota... now after a steep learning curve flashing over the air works even faster and much more convenient than with tasmota - just awesome!

Bought above GU10 bulb today at Action and the package has the barcode ending on 409 (as on the picture above)
My config:
- Flags: 4, 8, 10, 12, 16
- Startup: all channels -1 (together with flag 12 this makes the bulb power up in the last state)
- Startup command text: SM2135_Map 1 2 0 4 3
- Module config: P24 - SM2135DAT, P26 - SM2135CLK

During setup I encountered an issue (guess due to sloppiness) that I wanted to share in case someone runs into the same:
No matter what device map I configured both sliders (tone and brightness) did pretty random things, moving them a bit could change the color or brightness or tone on the same slider and the rgb picker did nothing at all Eventually I found out that at some point I used SM2235 everywhere instead of SM2135... small but significant difference.

After sorting that out the bulb is now happily integrated and works great!

.
Helpful post

#10 21348799 15 Dec 2024 09:16

snakesrules94 snakesrules94

Level 8
Helpful post? (+1)

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Post #10
21348799 15 Dec 2024 09:16

Hi there, got two of these bulbs in my drawer as spares and I had to use it yesterday.
The reference is now 3004919.1 on the package, FW 2.9.29 on BK7231T.

I convert using TCC and the main difference is that this bulb is using now SM2235 instead of SM2135.
I'm using this conf and everything is working fine :

Code: text Expand Select all Copy to clipboard
"pins": { "24": "SM2235DAT;0", "26": "SM2235CLK;0" }, "command": "SM2235_Map 0 1 2 3 4",

edit : I'm also using flags 4 & 8.

For your info, Action FR is now selling those bulbs by pack of 3 for 12€, I bought one yesterday, REF 3208076 but unfortunately, it seems to be an BK7231N on FW 1.5.32, known as a patched one so no big chance with those bulbs. I will use them on local tuya.
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#11 21350466 16 Dec 2024 11:39

tech1977 tech1977

Level 8

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Post #11
21350466 16 Dec 2024 11:39

snakesrules94 wrote:
For your info, Action FR is now selling those bulbs by pack of 3 for 12€, I bought one yesterday, REF 3208076 but unfortunately, it seems to be an BK7231N on FW 1.5.32, known as a patched one so no big chance with those bulbs. I will use them on local tuya.

Hi, Yesterday I bought two in Action IT and unfortunately there is firmware 1.5.32 ;
I'm desperately looking for GU10 bulbs to use with DDP RGBW protocol
#12 21350542 16 Dec 2024 12:41

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #12
21350542 16 Dec 2024 12:41

more and more devices are patched, maybe we should focus on figuring out the way to flash LEDs via UART without damaging them...

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#13 21350675 16 Dec 2024 14:35

tech1977 tech1977

Level 8

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Post #13
21350675 16 Dec 2024 14:35

>>21350542
Unfortunately I'm not very familiar with opening light bulbs and I would like to take a lot of them for the whole house
#14 21350762 16 Dec 2024 15:46

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Helpful post? (0)

Post #14
21350762 16 Dec 2024 15:46

You could try checking another, maybe smaller, Action shop. They still may have older batch.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#15 21359868 23 Dec 2024 12:57

snakesrules94 snakesrules94

Level 8

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Post #15
21359868 23 Dec 2024 12:57

tech1977 wrote:

snakesrules94 wrote:
For your info, Action FR is now selling those bulbs by pack of 3 for 12€, I bought one yesterday, REF 3208076 but unfortunately, it seems to be an BK7231N on FW 1.5.32, known as a patched one so no big chance with those bulbs. I will use them on local tuya.

Hi, Yesterday I bought two in Action IT and unfortunately there is firmware 1.5.32 ;
I'm desperately looking for GU10 bulbs to use with DDP RGBW protocol

Hello, also in Action France, they are now selling revision 3004919.2 version of the GU10 bulb with 1.5.32 FW. I guess the only chance to use it is with Tuya / Local Tuya. The implementation is not as free as you could have with OBK FW but it works.
#16 21360139 23 Dec 2024 17:01

tech1977 tech1977

Level 8

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Post #16
21360139 23 Dec 2024 17:01

>>21359868
Hi, unfortunately I want to use GU10 with DDP protocol so I need OBK or WLED firmware.
I'm looking for more GU10 bulbs
#17 21360299 23 Dec 2024 19:10

jeroenvtec jeroenvtec

Level 6

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Post #17
21360299 23 Dec 2024 19:10

I have bought also recently 2x3 gu10 leds (pack), hard to open* and different then here, no flash points found yet. 4 have firmware 1.5.32 and two 2.9.6 the last two has less dim and more brightness than 1.5.32. In tuya cloud they have different icons as well, 4 has the e27 and 2 have the glass gu10 version displayed.

*can't get whole chip out due to the 230v connection.
#18 21525803 20 Apr 2025 23:38

Mati Crawn Mati Crawn

Level 9

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Post #18
21525803 20 Apr 2025 23:38

I’ve got the same issue, there is WIFI module type - CBLC5 (BK7231N) mounted, with programming pads on the rear part.

The connection point and module type is described in topic https://www.elektroda.com/rtvforum/topic3951016.html

The first try was unsuccessful - the TX1/RX1 was quite fragile and has been torn off by the wire after soldering.
[url=https://obrazki.elektroda.pl/9062130600_1745185030.jpg]

Trying also with my favourite "spider" tool ..

Tomorrow second bulb ...Second try..
#19 21714346 08 Oct 2025 20:28

fantasyreader97 fantasyreader97

Level 1

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Post #19
21714346 08 Oct 2025 20:28

Mati Crawn wrote:
Tomorrow second bulb ...Second try..

Hi, did you have any luck with the second bulb? I am also considering to grab a few of those
Helpful post

#20 21825638 01 Feb 2026 03:33

nichtwitzig228 nichtwitzig228

Level 4

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Post #20
21825638 01 Feb 2026 03:33

Hi, I made a new post since the 3-Pack / new GU10 bulbs from LSC/Action are a bit different.
Hope it helps!
https://www.elektroda.com/rtvforum/topic4163315.html#21825637
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Topic summary

✨ The discussion addresses flashing the LSC Smart GU10-RGB bulb equipped with a BK7231T chip using OpenBK7231T firmware. The main issue is power supply overload when connecting the bulb's PCB GND and 3.3V points directly to a USB-to-serial converter's 3.3V line, which supplies only 50mA, causing the converter to hiccup due to insufficient current. Removing the onboard Schottky diode and 470µF capacitor did not resolve the problem. Recommendations include using a more robust external 3.3V LDO regulator (e.g., AMS1117-3.3V) to provide stable power, as the BK7231T can draw more than 50mA at peak. Various firmware versions and configurations for the GU10 bulb were shared, including SM2135 and SM2235 LED driver IC mappings and flag settings for OpenBK7231T. Newer bulb revisions with firmware 1.5.32 and BK7231N chips are noted as patched, limiting flashing options to Tuya or Local Tuya solutions rather than OpenBK7231T or WLED. Physical challenges in disassembling bulbs and accessing programming pads were also discussed, with some users reporting fragile TX/RX pads. Overall, stable external power supply and correct firmware configuration are critical for successful flashing and operation of these bulbs.
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FAQ

TL;DR: BK7231 can draw >50 mA at peak, so weak 3.3 V rails brown out; "I would never attempt to use such weak LDO." Use an external 3.3 V LDO, apply the correct SM2135/SM2235 mapping per revision, and avoid patched 1.5.32 unless using UART. [Elektroda, p.kaczmarek2, post #20307832]

Why it matters: This FAQ helps DIYers reliably flash LSC Smart GU10-RGB bulbs with OpenBeken by fixing power issues, choosing the right mappings, and deciding between OTA and UART.

Quick Facts

BK7231 peak current can exceed 50 mA, causing 50 mA 3.3 V adapters to hiccup or reset. [Elektroda, p.kaczmarek2, post #20307832]
Use a dedicated 3.3 V LDO (e.g., AMS1117-3.3) instead of the USB‑serial’s 3V3 pin. [Elektroda, p.kaczmarek2, post #20307832]
OTA via Tuya Cloudcutter worked on firmware 2.9.16 using the added profile. [Elektroda, alfakenzo, post #20355475]
Working SM2135 setup: P24=SM2135DAT, P26=SM2135CLK; SM2135_Map 1 2 0 4 3; flags 4,8,10,12,16; startup channels -1 for last state. [Elektroda, jrhenk, post #20460367]
Newer revision uses SM2235: P24=SM2235DAT, P26=SM2235CLK; SM2235_Map 0 1 2 3 4; flags 4 and 8. [Elektroda, snakesrules94, #21348799

Why does my USB-to-serial adapter hiccup or cycle when powering the LSC GU10 at 3.3 V?

The BK7231 draws current bursts above 50 mA. Many USB‑serial adapters can only source about 50 mA on 3.3 V. That underpowers the module, causing brownouts and USB resets. Use a dedicated, stable 3.3 V LDO to power the board during flashing and testing. Connect the LDO to the module’s 3V3 and GND points, not the mains supply. This eliminates hiccups and unstable boot cycles during UART sessions. [Elektroda, p.kaczmarek2, post #20307832]

What 3.3 V power supply should I use to flash reliably?

Use an external 3.3 V LDO with good headroom, such as an AMS1117‑3.3 module. Avoid using the 3V3 pin from USB‑serial adapters as the primary supply. An Arduino 3.3 V rail can work, but it is a hacky workaround. As one expert put it, "I would never attempt to use such weak LDO." A proper LDO greatly improves stability during flashing and initial configuration. [Elektroda, p.kaczmarek2, post #20307832]

Can I flash these bulbs OTA with Tuya Cloudcutter? Which firmware works?

Yes, certain batches flash OTA with Tuya Cloudcutter. Users confirmed success on firmware 2.9.16 when using the added device profile. After OTA, configure the LED driver mapping as needed for your hardware. If your bulb has different internals, verify the driver chip and mapping before applying templates. Newer patched firmware may block OTA entirely. [Elektroda, alfakenzo, post #20355475]

How do I wire UART safely to the BK7231 module?

Follow this quick 3‑step:

Disconnect mains and expose the PCB so you can reach 3V3, GND, TX, and RX.
Power the module from an external 3.3 V LDO. Tie grounds between the LDO and USB‑serial.
Connect RX↔TX, TX↔RX, and GND. Then flash OpenBeken using UART. A stable LDO supply prevents hiccups and connection drops during transfer. [Elektroda, p.kaczmarek2, post #20307832]

What is the correct SM2135 pin mapping and flags for LSC GU10?

A confirmed working setup uses P24=SM2135DAT and P26=SM2135CLK. Apply the command SM2135_Map 1 2 0 4 3. Flags tested: 4, 8, 10, 12, and 16. Set Startup: all channels -1. With flag 12, the bulb powers up in the last state. This combination integrates well and produces predictable sliders and color control. Always verify your hardware revision before copying a template. [Elektroda, jrhenk, post #20460367]

My sliders act randomly and the RGB picker does nothing. What did I misconfigure?

You likely selected the wrong LED driver type. One user had SM2135 hardware but configured SM2235, which broke sliders and color selection. Switch to SM2135 and apply the correct map. The issue vanished immediately. As they noted, it was a "small but significant difference." Hardware detection and driver selection matter for consistent control. [Elektroda, jrhenk, post #20460367]

Do I need flag 8 on this bulb?

No. Testing showed the bulb works the same with or without flag 8. If you have a stable configuration, you can leave flag 8 cleared. Focus on the mapping and the essential flags for your preferred behavior, such as last-state restore. [Elektroda, alfakenzo, post #20359158]

Why can’t I turn the bulb off when flag 9 is enabled?

On this model, enabling flag 9 made the color channel stay always on. That prevents proper off control. Clear flag 9 and retest. Keep flags minimal and add only those confirmed to help your exact configuration. This avoids mode conflicts that block toggling. [Elektroda, alfakenzo, post #20355475]

How do I configure the new 1.1 hardware that uses five PWM channels?

Map pins directly to PWM channels as reported: Pin 7 = WW (channel 5), Pin 8 = R (channel 1), Pin 9 = G (channel 2), Pin 24 = B (channel 3), and Pin 26 = CW (channel 4). This version behaves differently from SM2135/2235 designs. Configure PWM roles accordingly in OpenBeken and verify color temperature control. [Elektroda, alfakenzo, post #20372474]

What changed in revision 3004919.1 (FW 2.9.29)?

That revision swapped to SM2235. A working config uses P24=SM2235DAT and P26=SM2235CLK. Apply SM2235_Map 0 1 2 3 4. Users reported success with flags 4 and 8. Confirm the driver chip on your board before loading templates, as mappings differ from SM2135 units. [Elektroda, snakesrules94, post #21348799]

Are the latest Action GU10 bulbs patched against OTA, and what are my options?

Yes, newer batches like 3004919.2 ship with BK7231N firmware 1.5.32, which blocks Tuya Cloudcutter. Your options are Local Tuya integration or a UART flash if you can open the bulb. Factor this into purchases and stock checks before planning a deploy. [Elektroda, snakesrules94, post #21359868]

Any tips for UART on CBLC5 (BK7231N) modules in these bulbs?

CBLC5 modules expose programming pads on the rear. TX1/RX1 pads are fragile and can tear off with stressed wires. Use a pogo‑pin “spider” or light‑gauge wires with strain relief. Work slowly and verify continuity before powering. If pads lift, the module may be unrecoverable. [Elektroda, Mati Crawn, post #21525803]

Can I still find OTA‑flashable stock?

Try smaller or less busy Action stores. Older batches may still be on shelves. Check packaging revisions and barcodes before buying. This improves your chances of finding 2.9.x units that accept Tuya Cloudcutter and standard SM2135 mappings. [Elektroda, p.kaczmarek2, post #21350762]

How do I identify a likely OTA‑friendly unit from the packaging?

One confirmed case used a package with barcode ending in 409. That bulb flashed OTA and worked with SM2135 mapping and specific flags. Match your device profile in Tuya Cloudcutter, then apply the reported OpenBeken template. Hardware can vary, so verify after flashing. [Elektroda, jrhenk, post #20460367]

What’s the typical cost now, and what trade‑offs should I expect?

Action France sold a 3‑pack for 12 €. However, some packs (REF 3208076) contained BK7231N units with FW 1.5.32, blocking OTA. Budget for UART flashing tools or plan Local Tuya if you get patched stock. If you need custom firmware features, hunt older BK7231T batches. [Elektroda, snakesrules94, post #21348799]