The Update files must be Renamed with EBOOT.PBP and place them inside the UPDATE folder. Be careful to use the right update file for your PSP and charge the psp to make sure it won't run out of power while Updating to prevent bricking. Inside the Game folder inside the PSP folder should have 4 folder including the UPDATE Folder. Then copy the PSP and SEPLUGINS in the root of your PSP and overwrite everything.
Exactly the same process for all PSP models, PSP go will just use a separate Update file while the rest of the PSP models uses the same Update File.
But it you're already in 6.60 or 6.61, you can skip the update part, and just go ahead with the CFW. Just make sure you prepare the right CFW for your Firmware ver. And if ever you lose the cfw on your PSP, just simply run fast recovery. Sometimes when the psp lost power in a long time, it will lose the cfw and you'll have to run the fast recovery.
PSP Official Firmware
https://www.pspunk.com/psp-update/
660PRO-C
https://www.mediafire.com/?las5x8qfv2...
661PRO-C2
https://drive.google.com/file/d/1ycRT...
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