Alcor Micro controllers are very picky. A tool meant for an "AU6989" might not work for an "AU6989SN-GT." Search for "AlcorMP" followed by your controller model.
The error isn't necessarily a death sentence for your USB stick. In most cases, it’s a software "confusion" that can be cleared by re-flashing the controller. Just remember: using an MPTool will wipe all data on the drive. alcor micro unknown fa00 fw fa04 hot
You can see your files, but you can’t delete or add anything. Alcor Micro controllers are very picky
If you noticed the drive is physically while experiencing the FA04 error, this is a sign of a hardware short circuit. alcor micro unknown fa00 fw fa04 hot