How to add "No Check" patch

i have a ps3 with e3 nor flasher installed, i buyed the jb2usb dongle. can i use the jb2usb cfw with the ps3 mfw builder to modify it into a REBUG cfw and add a "no check" patch into it, so i can use a REBUG cfw with the jb2usb dongle without to risk a brick after a downgrade.

if yes, can someone tell me is there a task that i can add to the ps3mfw app to insert the "no check" patch.

i founded a task in ps3mfw:
"Patch firmware for installation shop/promo unit" is this the task to add the "no check" patch?

sorry for my english!