thanks bro!
I updated, have 2 questions:
1. I don't know who hacked it in the first place and how (got it 2nd hand), are there any residues I can delete before going online?
2. I enabled HEN and used multiman. now I want to go online. what should I do? guess I need to restart the console in order to disable HEN, what then?
First as long as HEN isn't enabled there is nothing to worry about Sony can't detect it. Now if you wanna go online with your backups you will need to disable syscalls. Haven't used HEN in a while but the app PSN Patch will do the job. You can even install it as a plugin but for now let's get you used to the setup.
Start console in offline mode
Enable HEN
Mount desired game
Launch PSN Patch
Disable syscalls & clear history
Log into PSN at this point
Reboot & repeat to swap games
Once you get the hang of if try installing as a plugin. You can then disable syscalls with a button combo. Also check out the latest webMAN MOD. I use it to launch ally games from the XMB. Takes a bit to setup but is easy once you get the hang of it. Just try what I told you and it's the safest way to use HEN/CFW online.