Hi.
Could I pls get some pointers on what to try next?
I am trying to perform firmware backup of a BK7231N (CB2S) from a Tuya smart plug (Sold in Australia as Arlec PC191HA Series 3). I haven't tried to flash a new firmware to it yet.
The read always fails at the CRC check.
What I have tried:
1) BK7231N at 921600 baud, 115200 baud, 230400 baud. The chip ID, Flash MID, and encryption key always read the same. But the "Send by BK" checksum changes at each attempt, and it's always different to the "our CRC", which also changes at each attempt.
2) BK7231T at 115200 baud and 230400 baud. Curiously, it usually doesn't wait for me to reset the bus, it usually starts reading the flash straight away. But the CRC check fails anyway. The CRC value always changes at each attempt.
3) BK7231U, BK7231M, etc all the way through the list to BK7258. Sometimes it aborted at the "non-standard encryption key", sometimes it failed at the CRC check.
I've successfully flashed two of these recently, however they were both BK7231T (slightly different PC191HA models)
Cheers
DGG
AI: Could you let us know which tool or software (and version) you're using for the firmware backup process?
BK7231 GUI Flash Tool build 263
AI: Can you describe your wiring/setup for connecting to the CB2S module (e.g., power source, connections, any level shifters or adapters used)?
CH340G USB to TTL Serial Converter Adapter Module 5V / 3.3V For Arduino, wired directly to the CB2S board (desoldered from the main board)
Could I pls get some pointers on what to try next?
I am trying to perform firmware backup of a BK7231N (CB2S) from a Tuya smart plug (Sold in Australia as Arlec PC191HA Series 3). I haven't tried to flash a new firmware to it yet.
The read always fails at the CRC check.
What I have tried:
1) BK7231N at 921600 baud, 115200 baud, 230400 baud. The chip ID, Flash MID, and encryption key always read the same. But the "Send by BK" checksum changes at each attempt, and it's always different to the "our CRC", which also changes at each attempt.
2) BK7231T at 115200 baud and 230400 baud. Curiously, it usually doesn't wait for me to reset the bus, it usually starts reading the flash straight away. But the CRC check fails anyway. The CRC value always changes at each attempt.
3) BK7231U, BK7231M, etc all the way through the list to BK7258. Sometimes it aborted at the "non-standard encryption key", sometimes it failed at the CRC check.
I've successfully flashed two of these recently, however they were both BK7231T (slightly different PC191HA models)
Cheers
DGG
AI: Could you let us know which tool or software (and version) you're using for the firmware backup process?
BK7231 GUI Flash Tool build 263
AI: Can you describe your wiring/setup for connecting to the CB2S module (e.g., power source, connections, any level shifters or adapters used)?
CH340G USB to TTL Serial Converter Adapter Module 5V / 3.3V For Arduino, wired directly to the CB2S board (desoldered from the main board)
