I have an idea, after reviewing usb-boot and our script/method!
Since you formated the one partition only instead of the whole drive, which partition table did it have? I am not sure if GPT partition table is supported by the RPi4 bootloader. With RPi3 it seems to be [EDIT: NOT!] possible: https://www.raspberrypi.org/forums/view ... p?t=205418
The usb-boot script clears and recreates the partition table for the whole drive with fdisk, hence it will be MBR by default. When using dietpi-drive_manager to be failsafe, select Format Mode: Drive
and Partition Type: MBR
. The RPi4 comes with a vast bootloader rewrite (now stored on an internal EEPROM), hence even that it is newer, but possibly it still lacks this features. Futher investigation required if a fresh MBR partition table fails as well.
Okay it seems to need to add this info to our script + set default entries accordingly:
- Format Mode: Drive
- Partition Type: MBR
- Filesystem Type: ext4 or f2fs