Flashing T103_V1.0 module, CPU: RTL8710BN with OpenBK7231T or ESPHome

I have this controller for Govee H61541A1 LED Strip Lights. The chip inside is T103_V1.0, this has W302 chipset, CPU is Realtek RTL8710BN. This chip & CPU is supported by LibreTiny.



I was wondering if anyone has flashed this chip with OpenBK7231T or ESPHome? I see a bunch of GPIO pads, so I am assuming flashing in-place should be possible, if not, de-soldering the chip should be easy enough. Any suggestion or input is valuable. There are only a handful mentions of this module online, one of them is from www.elektroda.pl

Additionally there's a Bluetooth chip, Mic & IR Receiver on the controller. I see no use for Bluetooth, however can Mic & IR be utilized in openbk7231t.

Hello

Mic is not currently supported in OpenBeken. IR is available on some platforms, but is used most extensively on Beken.

RTL8710BN is not currently supported by OpenBeken. Only RTL8720CF has seen recent development.

>>21362052
Yeah, you are right! OpenBK7231T doesn't support this chip. ESPHome supports it, so I automatically assumed OpenBK7231T would too.

So far I have not been able to connect to this chip via UART (trying to read the firmware). I followed the flashing instructions mentioned here. I have several ideas still left to try, I'll keep reporting. I don't have a heat gun, so can't remove the chip yet.

Good News! I was able to read flash using Itchiptool. Attached.

I had to use the TX2/RX2 & CEN pins from the module directly. The PCB pins were only good for VCC & GND, see image. Then follow the following instructions to get the chip into download mode:
- connect CEN to GND
- connect TX2 to GND
- release CEN from GND
- release TX2 from GND


But while analyzing the dump (attached), I get error: "File doesn't contain known storage area". Maybe I needed to do something else, not sure. I am new to this.

I then flashed esphome-kickstart (kickstart-rtl8710bn-2023-12-15.uf2). However, it doesn't get past input Wi-Fi screen. It accepts the Wi-Fi credentials, connects to router, but the UI never shows up. The kickstart uses following esphome config:

Quote:

rtl87xx:
board: generic-rtl8710bn-2mb-788k

However, the documentation suggests to use the following:

Quote:

rtl87xx:
board: t103-v1.0

which when I used and compiled ESPHome locally. I was able to get a fully working ESPHome. Great. But now I don't know the pinout and can't use esphome-kickstart to figure it out.

Someone help me figure out the pins! F1!F1!F1!

I've only ever really used OpenBeken I'm afraid. Easy Flasher extracts pin assignments from BK7231T and BK7231N

Edit: and actually AmebaZ2 backups

>>21364292 AmebaZ too, provided they are from tuya.
The one from this topic is not tuya, so nothing to extract of course.
I don't even know, what controls what there. Perhaps everything is controlled by tlsr, and wifi only acts as a relay between cloud and device itself. And if so, then i highly doubt the protocol is a TuyaMCU one.
And looking at the module i see that TX and RX (not log ones) are wired to something.

>>21364320
yeah! This is not Tuya, some Govee custom firmware, no wonder pin extraction failed.

You may be right about tlsr too. On the rear side PCB has 3 buttons (see image) to physically control the LEDs, they still work (although I can't confirm if they work as they did with the original firmware), which suggests to me that LED output is not dependent on or controlled through firmware.



At this point, I think, it would make more sense to replace this with one of the generic LED RGB controllers from AliExpress.

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