now struggling with "not a dos disk"
This means: reading boot sector successfully, but the readed data not a valid FAT boot sector.
I suggest use
EPDOS Disk Editor, for easy view what readed.
After enter EPDOS, press Abort on disk error, navigate to the D-EDIT, start it, Abort on disk error, press CTRL+F8 for switch Track/Sector mode.
ALT+Up/Down track change, ALT+Left/Right sector change, CTRL+Left/Right side change.