While awaiting, I found the following post:
So I changed the type of USB flash drive as well, and it finished the operation in less than 30 minutes! In my case, I tried the following USB drives (formatting as reported by GNOME Disks):
- Caused problems: SanDisk Cruzer Blade, 32GB, with 3 partitions, the one containing the medkit file formatted with “W95 FAT32 (LBA)”.
- Worked: Kingston DataTraveller G2, 4GB, formatted with “W95 FAT32”.
I think this should be mentioned in the documentation, so users like myself are a bit more careful with the selection of USB thumb drives for Mode 4 re-flashing.
It also seems to suggest that “all LEDs red” doesn’t necessarily mean a “critical operation” is in progress, as I simply pressed the reset button after waiting for almost 2 hours… maybe the Mode 4 code should be changed to detect “wrong flash drives” and notify the user via the LEDs (e.g. flashing them yellow) that the update won’t complete and that they need to try a different flash drive or a different mode.