Known issue with Raspberry Pi device

An outdated EEPROM bootloader can prevent your Raspberry Pi from booting successfully on its first flash. You'll know the issue is outdated EEPROM firmware if the LED lights flash but the screen stays black.

Why this happens: Your OS image's SD card uses a modern partition table format (GPT). Older EEPROM bootloader versions only know how to read the older MBR format and can't find a bootable partition on a GPT-only card — so the device stops silently before it can even reach the screen. Updating the EEPROM adds GPT support, letting the device read the card correctly.  

Workaround: Update the RPi EEPROM bootloader firmware to the latest version, then re-install Android OS: 

1. Insert SD card connector into your computer and open Raspberry Pi Imager.

2. Choose Device: Raspberry Pi 4/ Raspberry Pi 5 

3. Choose OS: scroll down and select Misc utility images > Bootloader (Pi 4 family / Pi 5 family) > SD Card Boot
4. Choose storage: your SD card connector
5. Let it flash.
6. Insert the SD card into your Raspberry Pi  and power it up. Wait for 15 seconds. The update was successful when green LED starts blinking. Then unplug it from power. 
7. Reflash Android OS and insert it into your Raspberry Pi. The device should now boot up.