Installing custom firmware onto my PS3 was one of my goals I mentioned in my project introduction post. This post describes my experiences during PS3 custom firmware installation on my fat CECHA01 console, and my brother's slim CECH-2101A console.
Update: I have written another post going into more detail on custom firmware installation using a Teensy on a CECH-2001A PS3 slim.
What is custom firmware, and what it's used for
Before I begin I'd like to provide some background information. Sony released firmware version 3.55 for the PS3 in late 2010. In this version Sony messed up the encryption system which allowed the PS3 hacking community to create custom firmware updates that could be installed, also called custom firmware or CFW.