Glad it is sorted; seems like a standard affair with various USB drives kicking around…
As a techie I keep my old USB drives for firmware updates…
simply formatting modern USB drives as FAT32 doesn’t always cut it…
find an ‘ancient’ (sub 4gig, idelly 2Gb or 'less size) and format it fat32 (whole drive, no extra partitions, especially drive backup software etc (eg Sandisk ‘rescue’ software as an example))…
should be straightforward from there… (follow webpage instructions)
I understand this has been sorted; cheers to the above…