I have fw 6.60 on my psp.it shows its presence on psp but when i format it using psp it says format failed 80220087 when i use pc to format memory stick it says it was unable to format
SOURCE: i cannot find mp_root when i connect psp into pc
ok adding on to lunasea808's answer u could also try manually making the MP_ROOT folder i would look on youtube for the correct way to manually put the MP_ROOT folder in there.
SOURCE: PSP is unable to read a memory stick
you should get repair your PSP. Then check if your memory stick work. For sure, the problem is on the PSP.
SOURCE: memory stick does not work
Connect the memory stick to your PC and format there. If it still fails, it's highly likely that your memory stick needs replacement
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