TOMTOM XL - Restoring using Explorer; keep getting corrupted

Hi

I just got a secondhand XL 330S which worked fine!

I tried to install the male TTS voice and got a corrupted file which I could not delete so I decided to format and restore from an Explorer backup .

I spent a whole day formatting the device!! to FAT32 using c prompt and tried copy/paste to restore the device which also took ages!!
I get corrupted files in my "USA/Canada \brand" folder ; it contains items which are clearly nonsense with strange symbols and with massive file sizes 5GB!!

I try to delete them but nothing I do will remove them!! It is driving me crazy!!

I have now started to format again but dont know what to do to stop getting corrupt files when I copy from the backup next time

Can anyone help?

thanks

There is no need to format, a flash memory can be deleted.
From what you say I would say start with posting all details we need.