Yes, try FAT32. (and Fn+F) add. Before the new mod prepare we must be sure that fpt utility can be used for bios flashing (To do this we should make a backup of the BIOS with the FPT utility and flash it back successfully)
recovery doesn't work.... question.... why backup is 4mb and original bios is 8mb? As i told i've 1 other unit... we can try... tell me all you need is there a switch to disable boot block write?