Upgrading/Downgrading PS3 Slim with broken BT/Wifi

I have a PS3 slim running OFW 4.81 with a broken bluetooth and wifi module. This means any attempt to perform a system update will cause the console to enter a reboot loop. This is a PS3 slim that is capable of running 3.55 firmware.

I'm trying to figure out what my options are for installing CFW on this console. From what I have read on this forum, the two options for installing CFW on this console are:

1. Upgrade to OFW 4.82 and use PS3xploit
2. Downgrade to 3.55 and install CFW

The...

Upgrading/Downgrading PS3 Slim with broken BT/Wifi