Hi everyone, I have a Bluetti AC180P that is currently in a “soft brick” or “zombie” state. I am looking for advice on how to recover it or if a firmware dump is available for ST-Link.
Symptoms:
- When pressing the Power Button, the button LED lights up.
- The BMS activates (I measured output voltage from the battery pack to the inverter board, it is present).
- The Screen remains completely black (no backlight, no info).
- AC and DC outputs do not turn on.
- Crucial: The device appears in the Bluetti App (Bluetooth scan works), but when trying to connect, it loads forever and fails (Connection Timeout).
Diagnostics performed (Teardown & Measurements): I have disassembled the unit and checked the Control Board (Green PCB with MCU):
1.) 12V Input Rail: Present and stable (coming from Main Board).
2.) 5V Rail: Present on the display flex connector.
3.) MCU Power (+3.3V): Checked at the DOWNLOAD debug header. Voltage is stable 3.3V.
4.) RESET Pin: Checked at the debug header. Voltage is 3.275V (High), so the MCU is not held in reset state.
5.) Display: Disconnecting the display flex cable does not change the behavior (App still sees device but cannot connect).
Conclusion: Since all power rails (12V, 5V, 3.3V) are stable and the RESET line is High, hardware seems fine. The fact that the Bluetooth is broadcasting suggests the MCU is partially alive but the main firmware seems corrupted or stuck in a bootloop.
Questions:
- Has anyone successfully recovered an AC180/AC180P from this state?
- Is there a way to force a firmware update via the App without establishing a full connection?
- Does anyone have a pinout or firmware dump for the ST-Link interface (SWDIO/SWCLK) for this specific board?
Any help is appreciated!