[Tutorial] Flashing OpenBK via OTA using tuya-cloudcutter

The discussion centers on flashing OpenBK firmware over-the-air (OTA) using the tuya-cloudcutter tool, emphasizing the critical need to verify the device's actual chip type (BK7231T or BK7231N) before flashing to avoid bricking. Due to inconsistent PCB labeling by Tuya (e.g., CB2S boards labeled incorrectly), physical inspection or running the 'run_detach' script is recommended to confirm chip identity. Flashing the wrong firmware version can cause devices to fail booting, requiring serial re-flashing methods. Recovery mode procedures vary by device but generally involve specific button press sequences to enable OTA flashing again. The conversation also explores the presence of CC8000 chips (possibly rebadged BK7231U) in some Tuya modules like the AVATTO bulb and WB2L devices, which differ from BK7231T/N chips and may require different flashing tools or SDKs. Attempts to back up and flash firmware on CC8000 modules using BK7231 tools show mixed results, with challenges in obtaining UART logs and successful firmware dumps. The CC8000's pinout appears compatible with BK7231, but bootloader and encryption differences complicate firmware development. Community members share firmware dumps, boot logs, and experiences flashing HLK-B30 modules with CC8000 chips, noting the need for specialized approaches. Recommendations include using UART1 (TX1/RX1) for flashing and UART2 for debug logs, pulling the CE pin high with a resistor (commonly 4.7k to 10k) to enable chip boot, and careful power supply considerations. The discussion references tools like BK7231GUIFlashTool, BKWriter, BK Easy Flasher, and highlights the importance of full flash backups before experimentation. Links to firmware dumps, GitHub repositories, and related documentation are provided for further development and troubleshooting.
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