CB2S BK7231N failed to flash Easy UART Flasher - failed with serial.BytesToRead 0 (expected 15)

Question

HI, I've just tried to flash OpenBK firmware on CB2S module with BK7231N chip by Easy Uart Flasher, but unfortunately it failed. I used Easy Uart Flasher v50 and OpenBK7231N_QIO_1.18.156 firmware. Photo I managed to do backup flash, and I think it was read properly as program managed to extract...

divadiow · Answer

probably a combination of wires being too long and or powering from 3.3v on USB-TTL. Try powering from 3.3v external power source. common grounds

MSP_Tech · Answer

I've switched it lab PSU.And also checked RX, TX lines with oscilloscope, they are clean and crisp.I mean I assume that if there's an issue with UART, it wouldn't be able to communicate with chip.But as you can see from log it reads some protection, erases memory, and only fails in the middle of the memory write.And what is most odd, it always fails at the same address for particular firmware (probably depends on bin file length, because in case of back up file it fails at another address).

MSP_Tech · Answer

So, a small update on this issue.
I've tried to make wires as short as possible, but no luck, it still fails at address 0x11000.
Then I tried to write OBK only and surprisingly system said write success. More of that, psu showed up to 0.08A consumption and one of leds starts to blink.
I've opened wifi connection on my phone and found openbeken device.
Next step I've tried to modify OBK file by program (basically added SSID of my home network), but once again program reported that write failed.
Log

Spoiler:

Starting write only OBK config!
Flasher mode: BK7231N
Going to open port: COM5.
Serial port open!
Getting bus... (now, please do reboot by CEN or by power off/on)
Getting bus success!
Going to set baud rate setting (115200)!
Will try to read device flash MID (for unprotect N):
Flash MID loaded: 1560EB
Will now search for Flash def in out database...
Flash def found! For: 1560EB
Flash information: mid: 1560EB, icName: TH25Q16HB, manufacturer: TH, szMem: 1000000, szSR: 2, cwUnp: 0, cwEnp: 7, cwMsk: 407C, sb: 2, lb: 5, cwdRd: 05-35-FF-FF, cwdWr: 01-FF-FF-FF
Entering SetProtectState(True)...
sr: 80
sr: 680
final sr: 680
msk: 407c
cw: 0, sb: 2, lb: 5
bfd: 0
SetProtectState(True) success!
Going to read encryption key...
Encryption key read done!
Encryption key: 510fb093 a3cbeadc 5993a17e c7adeb03
Preparing to write data file to chip - resetting bus and baud...
Getting bus... (now, please do reboot by CEN or by power off/on)
Getting bus success!
Going to set baud rate setting (115200)!
Will try to read device flash MID (for unprotect N):
Flash MID loaded: 1560EB
Will now search for Flash def in out database...
Flash def found! For: 1560EB
Flash information: mid: 1560EB, icName: TH25Q16HB, manufacturer: TH, szMem: 1000000, szSR: 2, cwUnp: 0, cwEnp: 7, cwMsk: 407C, sb: 2, lb: 5, cwdRd: 05-35-FF-FF, cwdWr: 01-FF-FF-FF
Entering SetProtectState(True)...
sr: 80
sr: 680
final sr: 680
msk: 407c
cw: 0, sb: 2, lb: 5
bfd: 0
SetProtectState(True) success!
Going to do erase, start 1904640, sec count 1!
Erasing sector 1904640... ok!
All selected sectors erased!

Now will also write OBK config...
Long name from CFG: OpenBekenX_D2
Short name from CFG: obkD2
Web Root from CFG: https://openbekeniot.github.io/webapp/
Writing config sector 0x1D1000...failed with serial.BytesToRead 0 (expected 15)
The beginning of buffer in UART contains data.
Writing OBK config data to chip failed.
Writing file data to chip failed.

Despite on that, I've rebooted device and ... it connected to my home wifi.
I've managed to open configuration server, set pin parameters, open app server and everything is working...

I have no idea what is happening here.
My wild guess would be that there is some mismatch between chip memory size and/or program memory size which makes program to think that write wasn't successful, while in fact everything was written.
I'll monitor plug behavior next couple of days and report if something goes wrong.

CB2S BK7231N failed to flash Easy UART Flasher - failed with serial.BytesToRead 0 (expected 15)

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