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How to fix RetroPie EXT4-fs Error (device mmcblk0p2) ext4_find_entry


I am getting EXT4-fs error (device mmcblk0p2) ext4_find_entry on Raspberry Pi 4 (RetroPie) randomly.

I have tried a few solutions:

  1. Flash the RetroPie official OS to the micro SD card.
  2. Replace with a new micro SD card.
  3. Try to fix it by fsck command.

but the problem happened again.

Solution:

I found it was a power problem, replace your power supply.