After attempting to use pandora's battery to get my friend's psp (FAT/PSP-1001/TA-082) up to 3.71 M33 from 3.73 OFW, the psp firmware seems to have been corrupted. It would start up with sony logo and then hang at the wavy lines with no xmb. I tried pandora's bettery several times over with both official firmware and m33 with the same results. (Using latest pandoras battery software. despertar cementario/pandora 3.xx by hellcat/OS pandora battery tool) I decided to try the original pandora battery the downgrades to 1.5. (14362_pandora) The downgrade was successful. I was able to update from 1.5 all the way through to 3.52 M33-3. Every time I tried to move to 3.71 M33 though it would react the same way. (hang with no xmb) I decided to leave it at 3.52 M33-3 since that should be suitable for all applications but then I noticed that it was not able to read from UMD disc. (yes, this is a new problem. my friend has never attempted to downgrade before. the psp was bought brand new) I used pandora to downgrade back to 1.50, still the same problem with UMD. I then upgraded to 3.40 OE-A and tried to attempt recovery and unpatch of idstorage key 5 since I planned to no longer use FW1.50. From 3.40 OE-A I was able to successfully update to 3.71 M33-2, however the same UMD problem occurred. I gave up on hacking it and decided to use pandora to go back to 3.71 OFW and then update to see if that would fix it. Once at 3.71OFW, i tried to update to 3.73OFW and recieved the error: "The system cannot be updated. This update data is not applicable for this system. (CTA80000025)". I now have a PSP that is unable to read UMDs and unable to update. (semi-useless) Has anyone had this problem before? Does anyone have any tips or ideas on what might have caused this issue?