Linux and android 17 booted in this device 😐

Reverse engineering is fun. I rescued this junk from e-waste to become daily tablet This tablet has died battery, and none sell the components. The BMS chip is FM3DXY known as permanent locking failure state whenever there's undervolt or overvolt, degraded cells causing it lockdown the battery. So i did reverse engineering the BMS with CH341A, emulate them with raspberry pico zero, and wired them up with new bms and battery cells. RP2040 is programmed to run on my BMS code firmware. Now this tablet no longer wired to hospital power supply just to keep it alive. It can able run on battery about 6 hours for daily light usage