nice simply method - but yes 99% sure your get the A224 error - i personaly did this on my sons ps3 and just put a new idps on the system , apparently you can reset the original idps to prevent this , changing ( 82 / 85 / 87 )
on the other systems i own i used idps set ( or something like that ) same kind of process but doesnt give you this error - its a pkg file - im sure if you youtube that name it will come up and i am sure the pkg is on here and can most likely link you if need be ( i think tustin made a thread on this back in the day )
good luck