it seems as though it can't find your CEX NOR/NAND dump to convert to DEX.
1)Dump rootkey (on 3.55cfw) using EID root key dumper
2)copy dump to usb(right slot) from eid_root_key from /dev_hdd0/tmp/
3)update to rebut 4.21
4)in rebug toolbox select "Export flash to file" (will also copy to usb right slot)
it seems as though it can't find your CEX NOR/NAND dump to convert to DEX.
1)Dump rootkey (on 3.55cfw) using EID root key dumper
2)copy dump to usb(right slot) from eid_root_key from /dev_hdd0/tmp/
3)update to rebut 4.21
4)in rebug toolbox select "Export flash to file" (will also copy to usb right slot)
you should have all files needed to continue
yeah i did all that and i still got the same error
so u click show files ? i had the same problem as you and that is what i did
i remember having the same issue… not being able to see extension to change it.
had to select show file extensions to be able to change to .bin, think your onto it mrhackerdude