Unable to update firmware OpenCentauri

My CC is on .29 firmware. Tired of running back and forth to the shop to turn on the light or similar, I decided to try OpenCentauri. Using a 32G PNY drive, I formatted it fat32 on my Linux box. Made the update folder, and in it put the downloaded update.swu file.

When I put it in the printer and check for updates, it shows an update available with a red dot. Pushing the appropriate buttons, I get to the screen where the CC says it is updating. After 30 minutes, still at 0%. With the same drive, I tried power cycling the printer (drive in socket) and starting the update that way. Same result (I did not wait 30 minutes, more like 5-10).

I reformatted the drive fat32 on a Windows10 laptop. Same results.

I used a different 32G PNY drive, tried updating via power cycle, same result.

I tried a no-name 16G drive, same result.

1. Does the drive size matter?

2. How long does a firmware update via USB take?

3. Any ideas what the problem is?