Not anywhere in
Rydian's guide (which I followed to the letter for my brand new Go a few months back) does it say use 620PRO_Permanent
before PROUPDATE. You must've followed something else to the letter.
In any case, everything's pretty self-explanatory and I never had to ask about the installation.
"
Run the 6.20 PRO Updater on your PSP and when it runs press X to install and launch the temporary 6.20 hack.
After the PSP restarts,
run the 6.20 PRO Permanent Patch."
The guide says 'After', which is a clear indication that you're supposed to do something before installing the 6.20 pro perma patch. You could've just read the sentence above it.
Did your school teach you to read books from the bottom upwards? If not, you're supposed to know that people are supposed read stuff from top downwards. It's your problem that you couldn't read the guide top downwards.