Nous Smart WiFi Bulb P3 RGBCW - CB2L + BP5758 - firmware change

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Post #1
20183171 10 Sep 2022 11:45

Hello, today another short topic about changing the firmware of an LED light, this time Nous, model P3-A60-RGB-CCT. In this product, I found a CB2L module (BK7231N), which programming pads have on the bottom, and unfortunately I had to solder it all out to get to them. In addition, there is a BP5758 LED driver in this light, which communicates with the WiFi module via their modified version of I2C. I will change the firmware to OpenBeken , which already supports the BP5758.
Below the packaging and instructions for the light:

Pairing with the manufacturer's app
The QR code from the packaging indicates some sort of Nous app, But I tried the Tuya app - it was able to pair.
The pairing mode starts in a standard way - turning the power of the light on and off five times. In the Tuya panel:

With the Tuya app, everything works. I do not discuss the Tuya app in detail, as this has been on the forum more than once.

Interior of Nous P3 RGBCW I got the lamp from a fellow forum member, So it was already open.

Markings on the plastic:

Board with power supply and WiFi module:

CB2L module:

Inputs:
[table:87782a3016] [tr:87782a3016] [td:87782a3016] [td:87782a3016]. 1[/td:87782a3016] [td:87782a3016] P8[/td:87782a3016] [td:87782a3016] I/O[/td:87782a3016] [td:87782a3016] [td:87782a3016] Support hardware PWM[/td:87782a3016] [/tr:87782a3016] [tr:87782a3016] [td:87782a3016] 2[/td:87782a3016] [td:87782a3016] 2[/td:87782a3016] [td:87782a3016] 2 P7[/td:87782a3016] [td:87782a3016] I/O[/td:87782a3016] [td:87782a3016] Support hardware PWM[/td:87782a3016] [/tr:87782a3016] [tr:87782a3016] [td:87782a3016] 3[td:87782a3016] 3[/td:87782a3016] [td:87782a3016] P6[/td:87782a3016] [td:87782a3016] [td:87782a3016] I/O[/td:87782a3016] [td:87782a3016] Support hardware PWM[/td:87782a3016] [/tr:87782a3016] [tr:87782a3016] [td:87782a3016] 4[/td:87782a3016] [td:87782a3016] P26[/td:87782a3016] [td:87782a3016] I/O[/td:87782a3016] [td:87782a3016] Support hardware PWM[/td:87782a3016] [/tr:87782a3016] [tr:87782a3016]

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p.kaczmarek2 p.kaczmarek2

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#2 20185835 12 Sep 2022 01:56

Mateusz_konstruktor Mateusz_konstruktor

Level 36

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Post #2
20185835 12 Sep 2022 01:56

Internal software capabilities have undeniably been increased, but what about the case?
.
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#3 20185921 12 Sep 2022 07:59

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #3
20185921 12 Sep 2022 07:59

As I wrote in the content of the topic - I got the lights from a colleague in the forum, for which I thank him, of course. They just already came to me in the form of such a "tailpiece". But the others from the received set were in better condition:

But the fact is, as I wrote in the summary - I wonder what I will do with this lamp now? I have to select the body from another damaged one.

Of course, the authors of tuya-cloudcutter will rise to the occasion, then the next will not have to open to program. The full 2MB of batch I sent in on the repository on github.

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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#4 20186265 12 Sep 2022 12:18

Mateusz_konstruktor Mateusz_konstruktor

Level 36

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Post #4
20186265 12 Sep 2022 12:18

p.kaczmarek2 wrote:
I'm wondering what I'm going to do with this lamp now?

As it stands now, it is no longer a lamp, due to the damaged housing.
We have a collection of components.

p.kaczmarek2 wrote:
I need to select the body from another damaged one.
Yes do that and describe YOUR workmanship of restoring it to a usable condition
p.kaczmarek2 wrote:
As long as the authors of tuya-cloudcutter are up to the task then the next ones will not need to be opened to program. I have uploaded the full 2MB of batch in on the repository on github.
If even this were to happen, there still remains the manufacturer of the entire device itself may not be interested in creating a way for the user to make internal software changes themselves.
#5 20187139 12 Sep 2022 21:59

khoam khoam

Level 42

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Post #5
20187139 12 Sep 2022 21:59

The funny thing is that tuya-cloudcutter takes advantage of a bug (vulnerability) in the SDK for BK7231, which causes an out-of-memory exception. The authors informed Tuya of this bug in February this year, and Tuya has committed to fixing the bug in subsequent versions of the SDK. So it is possible that in newer Tuya gadgets it will no longer be possible to remotely upload "foreign" firmware as long as the original firmware is in place.
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