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Updating EEProm

Since Raspberry Pi 4, Raspberry Pi flagship devices use an EEPROM bootloader. The main difference between these and previous products is that the second-stage bootloader is loaded from SPI flash EEPROM instead of the bootcode.bin file used on previous products.

More Info

You can update the eeprom via the following commands on a functioning/booted board: 

sudo apt update
sudo apt full-upgrade -y
sudo rpi-eeprom-update -a
sudo reboot

References

Disclaimer: Information provided "as is" with no guarantee of accuracy. Board-level repair involves risk — you accept full responsibility for any outcomes. Not professional repair advice. Full disclaimer.