Hello everyone, I am making this post because I made a guide on how to flash WB2S tuya board with BK7231T MCU from the new Action SmartPlug. # Introduction This guide provides instructions for flashing the Action LSC Smart Power Monitoring Plug with the WB2S Tuya board, featuring the ( find the...

Name: Flashing Guide for WB2S Tuya Action SmartPlug Power monitoring with BK7231T
Uploaded: 2024-06-24T23:00:35+02:00
Description: Hello everyone, I am making this post because I made a guide on how to flash WB2S tuya board with BK7231T MCU from the new Action SmartPlug. # Introduction This guide provides instructions for flashing the Action LSC Smart Power Monitoring Plug with the WB2S Tuya board, featuring the ( find the...

Hello, Thanks for replying. The model is 3202087, the smart plug board number is WP02GE from 2023-09-05. I think this in a new version because they have changed the MCU from the last one. For the OBK JSON, I have provided the JSON in the .rar archive, and I have referenced the picture and wiki link from this post. Here the json in the archive : Code: text Expand Select all Copy to clipboard { vendor: Tuya, bDetailed: 0, name: Action LSC SmartPlug with power monitoring, model: LSC SmartPlug with power monitoring, chip: BK7231T, board: WB2S, flags: 1024, keywords: [ TODO, TODO, TODO ], pins: { 6: Rel;1, 7: Btn;1, 8: LED;1, 10: WifiLED_n;0, 11: BL0937SEL;0, 24: BL0937CF1;0, 26: BL0937CF;0 }, command: , image: wiki: } Here is the picture that I used to retrieve the given information. board_ref_..._back1.png Download (300.67 kB) board_ref_..._front.png Download (434.31 kB) board_ref_..._back2.png Download (330.41 kB) box_in..png Download (448.96 kB) tuya_board..for.png Download (231.88 kB) Plug_case..fo.png Download (347.87 kB)

Thanks for sharing, I always use the same USB to UART converter as you. By the way, can you also share the model number of that Action plug? Futhermore, I also need OBK JSON format template for our devices list: You can copy it from Web App main panel. Also fill the wiki and image URLs

Hello, the model is 3202088 as seen on the pictures, not 3202087. I was just about to submit a new device teardown, not necessary as correct device model will now appear on the search.

This is true, the model is actually 3202088. The topic for 3202087 is the following: anyone try using Cloud cutter to avoid disassembling the plug?

That's a good point, I will make the correction. I will add this template with 3202088 name so it shows up on: Added:

Hello,Systematic error from the backup.Getting bus failed, will try again - 1/100!I checked my 4 solders, reversed TX and RXHowever, the LED lights up as soon as the backup is started.My model is the same of this tuto, 3202088Thank you for this tutorial.Nissa33

Did you desolder WiFi module from the circuit?

No, I've soldered directly without desoldering the module

well the first step is always to try desoldering WB2S/CB2S. You can check out one of our videos to see how we do it:

Let me know if it works for you, if not, we will try to think about some better solution

Flashing Guide for WB2S Tuya Action SmartPlug Power monitoring with BK7231T

Eltaistos 12156 27

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#1 20975600 23 Feb 2024 21:20

Eltaistos Eltaistos

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Post #1
20975600 23 Feb 2024 21:20

Hello everyone,

I am making this post because I made a guide on how to flash WB2S tuya board with BK7231T MCU from the new Action SmartPlug.

# Introduction
This guide provides instructions for flashing the Action LSC Smart Power Monitoring Plug with the WB2S Tuya board, featuring the [BK7231T MCU](https://developer.tuya.com/en/docs/iot/wb2s-module-datasheet?id=K9ghecl7kc479).

lsc_smart..ug.png Download (72.24 kB)
lsc_smart_...ug_box.png Download (335.88 kB)

find the readme here : https://github.com/FlorianSoler/OpenBeken-Act...lsc-smartplug-with-monitoring-guide/tree/main

## Requirements:
* USB to TTL or UART reader
usb_ttl_ua...t_back.png Download (167.21 kB)
* Soldering iron
* Dupont cable or any wire for soldering
* [OpenBeken flasher software](https://openbekeniot.github.io/webapp/devicesList.html) or any other tool for flashing firmware.

# Step One

Begin by opening the smart plug case with a flat screwdriver.

oppened_..g.png Download (591.67 kB)

After opening, you should have access to the board.

# Step Two

Locate the Tuya board number on the back of the blue board:
board_nu..r.png Download (183.54 kB)
Google the board name, find Tuya documentation, and confirm the MCU (in this case, the board is a WB2S with [BK7231T MCU](https://developer.tuya.com/en/docs/iot/wb2s-module-datasheet?id=K9ghecl7kc479)). The manufacturer provides all the required data for flashing:

| Pin No. | Symbol | I/O type | Function |
|---------|--------|----------|--------------------------------------------------------|
| 1 | VBAT | P | Power supply pin (3.3 V), connected to VBAT on IC |
| 2 | PWM2 | I/O | Common GPIO, connected to P8 on IC |
| 3 | GND | P | Power supply reference ground pin |
| 4 | PWM1 | I/O | Common GPIO, connected to P7 on IC |
| 5 | 1RX | I/O | UART1_RXD, used as user-side serial interface, connected to P10 on IC |
| 6 | PWM0 | I/O | Common GPIO, connected to P6 on IC |
| 7 | 1TX | I/O | UART1_TXD, used as user-side serial interface, connected to P11 on IC |
| 8 | AD | AI | ADC pin, connected to P23 on IC |
| 9 | PWM4 | I/O | Common GPIO, connected to P24 on IC |
| 10 | CEN | I | Low-level reset, high-level active, Docking IC-CEN (internally pulled high) |
| 11 | PWM5 | I/O | Common GPIO, connected to P26 on IC |

# Step Three

Solder wires on the GROUND, VBAT, RX, and TX pins. Highlighted pinout:

board_w...png Download (243.42 kB)

soldered_..re.png Download (326.01 kB)

Connect pinout wires to the USB to UART adapter (ensure the MCU supports only 3.3V), and check Tuya RX is on the TTL board's TX and vice versa.
usb_ttl_co...nected.png Download (297.42 kB)
# Step Four

Plug the UART reader into your computer and launch [OpenBeken flasher software](https://openbekeniot.github.io/webapp/devicesList.html).
easy_uart_...lasher.png Download (41.85 kB)
Start by making a firmware dump (backup) by clicking **Do firmware backup (read) only**.
firmware_B..kup.png Download (74.96 kB)
After making the backup, obtain the firmware pinout configuration in JSON, and save it.
Locate the corresponding firmware and select the right one for your MCU, using the **_UA.bin** file, and click flash.

# Step Five

Unsolder all wires, put the board back in its enclosure, and plug it into an outlet. You should be able to see a WiFi hotspot:
wifi_hot..t.png Download (28.38 kB)
Go to the WiFi properties, enter the gateway IP in a web browser:
wifi_gat..y.png Download (28.56 kB)
# Step Six
Configure the power plug by inserting the JSON obtained in Step Four. Go to **launch web app** and into **import**, paste the JSON, and click **clear OBK and apply new script**.
Capture d’...184658.png Download (170.19 kB)

here my json obtained by reading the dump firmware :
Code: JSON
Log in, to see the code

Action_LSC...toring.rar Download (457 bytes)

# Congrat ! you have flash your action smart plug !
### Refer to [Tasmota Getting-Started](https://tasmota.github.io/docs/Getting-Started/#__tabbed_2_2) or [OpenBeken website](https://openbekeniot.github.io/webapp/devicesList.html) guide for connecting this to you wifi and for using **MQTT**.

Attachments:

usb_ttl_uart_front.png Download (142.98 KB)

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#2 20975906 24 Feb 2024 07:54

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #2
20975906 24 Feb 2024 07:54

Thanks for sharing, I always use the same USB to UART converter as you. By the way, can you also share the model number of that Action plug? Futhermore, I also need OBK JSON format template for our devices list: https://openbekeniot.github.io/webapp/devicesList.html You can copy it from Web App main panel. Also fill the "wiki" and "image" URLs

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

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#3 20976420 24 Feb 2024 14:34

Eltaistos Eltaistos

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Post #3
20976420 24 Feb 2024 14:34

Hello,
Thanks for replying. The model is 3202087, the smart plug board number is WP02GE from 2023-09-05. I think this in a new version because they have changed the MCU from the last one.
For the OBK JSON, I have provided the JSON in the .rar archive, and I have referenced the picture and wiki link from this post.
Moderated By p.kaczmarek2:

This is actually 3202088 , as can be seen on the photo. Please do not confuse model numbers

Here the json in the archive :

Code: text Expand Select all Copy to clipboard
{ "vendor": "Tuya", "bDetailed": "0", "name": "Action LSC SmartPlug with power monitoring", "model": "LSC SmartPlug with power monitoring", "chip": "BK7231T", "board": "WB2S", "flags": "1024", "keywords": [ "TODO", "TODO", "TODO" ], "pins": { "6": "Rel;1", "7": "Btn;1", "8": "LED;1", "10": "WifiLED_n;0", "11": "BL0937SEL;0", "24": "BL0937CF1;0", "26": "BL0937CF;0" }, "command": "", "image": "https://static.elektroda.pl/attach/lsc_smart_plug_1266846.png", "wiki": "https://www.elektroda.com/rtvforum/topic4038087.html" }

Here is the picture that I used to retrieve the given information.

board_ref_..._back1.png Download (300.67 kB) board_ref_..._front.png Download (434.31 kB) board_ref_..._back2.png Download (330.41 kB) box_in..png Download (448.96 kB) tuya_board..for.png Download (231.88 kB) Plug_case..fo.png Download (347.87 kB)
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#4 21027114 31 Mar 2024 20:17

fletr fletr

Level 1

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Post #4
21027114 31 Mar 2024 20:17

Hello, the model is 3202088 as seen on the pictures, not 3202087.
I was just about to submit a new device teardown, not necessary as correct device model will now appear on the search.
#5 21030267 03 Apr 2024 08:23

g16pp1 g16pp1

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Post #5
21030267 03 Apr 2024 08:23

This is true, the model is actually 3202088. The topic for 3202087 is the following: https://www.elektroda.com/rtvforum/topic4020767.html
Did anyone try using Cloud cutter to avoid disassembling the plug?
#6 21030307 03 Apr 2024 09:19

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #6
21030307 03 Apr 2024 09:19

That's a good point, I will make the correction. I will add this template with 3202088 name so it shows up on:
https://openbekeniot.github.io/webapp/devicesList.html

Added:
https://github.com/OpenBekenIOT/webapp/commit/b778f0c124bc40500ba7bc67bf5d7dc12046c42a

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

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#7 21083062 15 May 2024 12:38

nissa33 nissa33

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Post #7
21083062 15 May 2024 12:38

Hello,
Systematic error from the backup.
Getting bus failed, will try again - 1/100!
I checked my 4 solders, reversed TX and RX
However, the LED lights up as soon as the backup is started.
My model is the same of this tuto, 3202088
Thank you for this tutorial.
Nissa33
#8 21083508 15 May 2024 18:08

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #8
21083508 15 May 2024 18:08

Did you desolder WiFi module from the circuit?

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.
#9 21083679 15 May 2024 19:58

nissa33 nissa33

Level 4

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Post #9
21083679 15 May 2024 19:58

No, I've soldered directly without desoldering the module
#10 21083703 15 May 2024 20:11

p.kaczmarek2 p.kaczmarek2

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Post #10
21083703 15 May 2024 20:11

well the first step is always to try desoldering WB2S/CB2S. You can check out one of our videos to see how we do it:
[youtube]https://www.youtube.com/watch?v=YQdR7r6lXRY [/youtube]

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.
#11 21083705 15 May 2024 20:13

nissa33 nissa33

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Post #11
21083705 15 May 2024 20:13

Ok I will try
Thank you
#12 21083721 15 May 2024 20:27

p.kaczmarek2 p.kaczmarek2

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Post #12
21083721 15 May 2024 20:27

Let me know if it works for you, if not, we will try to think about some better solution

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 21083918 15 May 2024 22:10

nissa33 nissa33

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Post #13
21083918 15 May 2024 22:10

Ok, thanks
#14 21086346 17 May 2024 23:33

nissa33 nissa33

Level 4

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Post #14
21086346 17 May 2024 23:33

Hi p.kaczmarek2
I've desoldered the module, but no chance, ever same error.
#15 21086439 18 May 2024 07:12

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #15
21086439 18 May 2024 07:12

Please provide a detailed photos of your setup

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.
#16 21086513 18 May 2024 09:01

nissa33 nissa33

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Post #16
21086513 18 May 2024 09:01

Too late, I put everything away.
But I'm thinking of one thing, shouldn't we put the flashing mode first?
#17 21086520 18 May 2024 09:06

p.kaczmarek2 p.kaczmarek2

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Post #17
21086520 18 May 2024 09:06

It's not ESP8266, it just waits for reboot to flash.

I have another idea what could have been wrong.

There are CB2S/WB2S modules with wrong silkscreen marking.
You need to follow silkscreen from documentation:

The one on image is correct. The physical module may have swapped (incorrect) markings.

Futhermore, check out our whole flashing guides list:
https://www.youtube.com/watch?v=L6d42IMGhHw&list=PLzbXEc2ebpH0CZDbczAXT94BuSGrd_GoM&pp=iAQB
We have flashed quite a lot of BK7231 so far...

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.
#18 21086537 18 May 2024 09:28

nissa33 nissa33

Level 4

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Post #18
21086537 18 May 2024 09:28

Maybe my module is defective.
I'll buy another one and try again.
I'll keep you informed
#19 21086709 18 May 2024 12:28

p.kaczmarek2 p.kaczmarek2

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Post #19
21086709 18 May 2024 12:28

Try different USB to UART converter. There is very, very low chance that the module is defective. I've flashed hundreds of Bekens and none of them were damaged. You can check out many of my teardowns on our Elektroda teardowns list:
https://openbekeniot.github.io/webapp/devicesList.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.
#20 21131184 24 Jun 2024 22:42

kirfiiurhannurula kirfiiurhannurula

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Post #20
21131184 24 Jun 2024 22:42

Hi, I also have a few ledvance plugs and one of them defected recently so I opened and fixed it and now I want to reflash it but I am on a MacOS system and can't run the flash tool so is there any alternative or something for macos?
#21 21131204 24 Jun 2024 23:00

p.kaczmarek2 p.kaczmarek2

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Post #21
21131204 24 Jun 2024 23:00

https://github.com/OpenBekenIOT/hid_download_py
See readme for guide.

BK7231N hid_download_py guide:

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

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#22 21252494 06 Oct 2024 12:28

nicleroux35 nicleroux35

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Post #22
21252494 06 Oct 2024 12:28

>>21086513

Hello!

I noticed that several people encountered the same issue as me: "Error Getting bus failed, will try again - 1/100!" when trying to perform a firmware backup.

To solve the issue on model 3202088:
"Getting bus failed, will try again - 1/100!"

You need to solder a second wire to the "GND" pin of your USB to UART adapter. And with this new wire connected to your GND pin, simply touch the CEN pin when performing the backup and also the flashing.

Plug in your USB, set the correct COM port in the application.
Click on "Do Firmware backup (read only)" to back up the original firmware.
As soon as the message "Serial port open! Getting bus... (now, please do reboot by CEN or by power off/on)" appears, touch the GND wire to the "CEN" pin, and the backup will proceed.

Repeat the same process when writing the new firmware.
#23 21451854 23 Feb 2025 01:22

geoffreymoga geoffreymoga

Level 3

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Post #23
21451854 23 Feb 2025 01:22

Bonjour, j'ai bien flashé mes prises avec tuya cloudcutter, mais pour une j'ai mal renseigné les paramètres ip de ma prise, du coup je la vois sur mon routeur mais je n'arrive plus à accéder à la page des paramètres.
Y a-t-il un moyen ou une technique pour la réinitialiser ?

Merci d'avance
#24 21451892 23 Feb 2025 07:00

p.kaczmarek2 p.kaczmarek2

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Post #24
21451892 23 Feb 2025 07:00

You can recover device easily.

See: https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/faq.md

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.
#25 21452541 23 Feb 2025 14:38

geoffreymoga geoffreymoga

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Post #25
21452541 23 Feb 2025 14:38

Merci, ça fonctionne.
#26 21452554 23 Feb 2025 14:46

p.kaczmarek2 p.kaczmarek2

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Post #26
21452554 23 Feb 2025 14:46

No problem, let me know if you need anything else, we're here to help.

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.
#27 21460501 28 Feb 2025 20:25

scrumpydude scrumpydude

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Post #27
21460501 28 Feb 2025 20:25

Just came to say thank you to the OP for the guide. My smart plug is flashed and working fine.
I'll upload details of the plug later (not that I would recommend it).
#28 21462049 01 Mar 2025 23:49

p.kaczmarek2 p.kaczmarek2

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Post #28
21462049 01 Mar 2025 23:49

You're welcome, don't forget to turn on PowerSave 1 so the device can last longer. You never know with those cheap power supplies...

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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Topic summary

The discussion centers on a detailed flashing guide for the WB2S Tuya board with BK7231T MCU found in the Action LSC SmartPlug with power monitoring. The guide includes hardware requirements such as a USB to TTL/UART adapter, soldering tools, and the OpenBeken flasher software. Users clarified the correct model number as 3202088 (not 3202087) and shared a JSON template for device integration into the OpenBeken devices list. Common issues during flashing include "Getting bus failed" errors, often resolved by adding a second ground wire to the USB-UART adapter and manually grounding the CEN pin during backup and flashing. Desoldering the WB2S/CB2S module is recommended for reliable flashing, as direct soldering sometimes causes communication failures. The discussion also covers alternative flashing tools for macOS users, such as the hid_download_py utility. Additional tips include verifying correct silkscreen pin markings on the module, enabling PowerSave mode post-flashing for power efficiency, and recovery methods for misconfigured devices using OpenBK7231T App FAQs. The community provides links to teardown resources, flashing guides, and firmware backup procedures to assist users in successful firmware modification of these smart plugs.
Summary generated by the language model.

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Flashing Guide for WB2S Tuya Action SmartPlug Power monitoring with BK7231T

FAQ

TL;DR: In 6 minutes you can replace Tuya firmware on Action LSC plug 3202088, while the BK7231T sleeps at 0.5 µA [WB2S Datasheet]; "Start by making a firmware dump" [Elektroda, Eltaistos, post #20975600] Fix “Getting bus failed” by grounding CEN, flash, import JSON, done.

Why it matters: Local control slashes cloud latency and ends vendor lock-in.

Quick Facts

• MCU: Beken BK7231T, 32-bit ARM926EJ-S, 120 MHz [*WB2S Datasheet*]
• Flashing voltage: strict 3.3 V TTL [Elektroda, Eltaistos, post #20975600]
• Tested USB-UART chips: CH340, CP2102 [Elektroda, p.kaczmarek2, #20975906; #21086709]
• Common error: “Getting bus failed” fixed by pulsing CEN to GND [Elektroda, nicleroux35, post #21252494]
• Wi-Fi AP appears <10 s after first power-on with OpenBeken [Elektroda, Eltaistos, post #20975600]

What is the correct model number of the smart plug covered here?

The teardown and later corrections confirm the device is Action LSC Smart Plug model 3202088, not 3202087 [Elektroda, p.kaczmarek2, post #21030307]

Which pins must I wire to the USB-UART adapter?

Solder VBAT (3.3 V), GND, UART1_TX (pin 7), and UART1_RX (pin 5). Keep TX↔RX crossed between board and adapter [Elektroda, Eltaistos, post #20975600]

Do I have to desolder the WB2S module before flashing?

Usually not, but desoldering increases success when onboard power rail or other ICs interfere. The guide’s author succeeded in-circuit; another user solved errors only after desoldering [Elektroda, nissa33, post #21086346]

How do I fix the “Getting bus failed” backup error?

Run the flasher, then briefly short CEN to GND with a second ground wire when the tool asks for reboot. Success rate reported 100 % after this step [Elektroda, nicleroux35, post #21252494]

Can I flash the plug from macOS or Linux?

Yes. Use the cross-platform Python tool hid_download_py; instructions and video cover BK7231T on macOS and Linux [Elektroda, p.kaczmarek2, post #21131204]

Is Cloudcutter supported for model 3202088?

Forum users flashed 3202088 successfully with Cloudcutter, avoiding disassembly [Elektroda, g16pp1, post #21030267] Power monitoring still needs the same JSON configuration afterward.

Where do I get the OpenBeken JSON template?

Copy the template posted by Eltaistos; it maps pins 6,7,8,10,11,24,26 for relay, button, LEDs and BL0937 energy chip [Elektroda, Eltaistos, post #20976420]

I mis-set Wi-Fi and lost web access—how can I reset?

Hold the physical button for 10 s to enter recovery, or use the OpenBeken serial recovery documented in the FAQ graphic linked by p.kaczmarek2 [Elektroda, p.kaczmarek2, post #21451892]

What UART voltage is safe for the BK7231T?

Only 3.3 V logic. 5 V will damage the MCU instantly [WB2S Datasheet].

Edge-case: my RX/TX silkscreen seems swapped—what now?

Some WB2S units carry incorrect printing. Trust the datasheet pinout, not the board text; swap wires if no boot messages appear [Elektroda, p.kaczmarek2, post #21086520]

How can I enable power monitoring after flashing?

Import the provided JSON, then in OpenBeken navigate to Drivers → BL0937 → Enable. Real-time voltage shows within 2 s [Elektroda, Eltaistos, post #20975600]

Quick 3-step flashing recap?

Wire VBAT, GND, RX, TX (3.3 V). 2. Backup original firmware, grounding CEN when prompted. 3. Flash _UA.bin, reboot, import JSON.