If you noticed the drive is physically while experiencing the FA04 error, this is a sign of a hardware short circuit.

The drive's light flashes rapidly but never initializes. How to Fix the "Unknown FA00 FW FA04" Error

To fix this, you generally need a . This is specialized software used in factories to "burn" the firmware onto the controller. Step 1: Identify Your Controller

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.

Alcor Micro is a major manufacturer of USB flash drive controllers. When a drive is functioning correctly, it reports its real capacity and brand name. However, when the firmware becomes corrupted—due to improper ejection, power surges, or NAND wear—it enters a or a generic state.

Hit "Start" and wait. Do not unplug the drive. If successful, the status bar will turn green, and the "FA00" error will be replaced by the drive’s actual capacity. Why is my drive getting "Hot"?

In the context of flash drive repair forums, "hot" often refers to a "Hot Plug" method or a trending firmware fix for a specific batch of chips (like the AU6989 series) that recently hit the market. Common Symptoms

If the drive burns your finger, software likely won't fix it. The controller or a capacitor has likely failed. Conclusion

The drive shows up as a "Generic USB Hub" or "Unknown Device" with 0 bytes of space.

Sometimes the controller gets stuck in an infinite boot loop trying to communicate with a dead NAND cell, causing it to overheat.