Pero he leido algo sobre no sobreescribir los CIPL o algo así en placas malditas porque se brickea la psp. Por eso pregunto, es que me da miedo.

Cito textualmente:

Note that PRO and ME firmwares can coexist on the same PSP without any conflicts whatsoever as long as both share base OFW version (for example, you can have both CFWs on 6.20 or 6.60, but you can’t simultaneously have one CFW on 6.20 and another on 6.60 on the same device).

Owners of fully hackable PSPs (that is, early PSP-2000s and all PSP-1000s) should be extra careful to not mismatch CIPLs if installing PRO on top of ME (but not LME) to avoid bricking. Follow tutorials to the letter (DO NOT restart or shutdown PSP until new CIPL is flashed immediately after installing PRO files to flash0) and have a full NAND backup with working Pandora ready just in case. Other PSPs (manufactured in late 2008 and newer) cannot have custom IPLs to begin with, so it’s a non-issue for these models.

Gracias.