All GHI’s NETMF products include an exclusive feature called RLP. This feature allows you to load native code while still using C# and NETMF. Basically, you keep all commercial grade libraries (FAT/USB/threading) and can also add your own if needed. But in some rare cases, someone may want to run a different OS on FEZ, like Python (this was actually done already). In this case a complete erase is need to FEZ.
Here is how to completely erase it…Do NOT do this if you are using RLP!
Note that once you load this file then you automatically void the warranty. This is also irreversible, once erased, firmware can’t be put back.
You must have a good power source before you do this.
To wipe out the board clean, load this file like if you were updating firmware. Here it is http://www.tinyclr.com/downloads/Porting/USBizi_ERASE.zip
Now wait for 10 seconds while the loaded software erases everything…you now have a blank FEZ board.