Ohhh, an official one. You may be better off converting it into a bin and creating a 2352 .cue for it. Type 'pbp into iso reddit' into Google and the first thing that pops up might help you.
I did what you told me and it led me to a decryptor tool for official eboot.
So would it be easier to just make a multi-disc eboot from a PS1 backup and get that one working. Because my PSP is not working anymore and PPSSPP is crashing when im trying to decrypt the header.