it's actually SOOO simple.
Quote:
Originally Posted by gambatte
Q1: You will need BuildOS, aka "the kitchen". This is where you "cook" the customized ROM to your carrier specification and can add some additional programs. There are alot of versions and you can get the current in the stickies at the top of this upgrade subforum. I believe the ugraded LennySH is the most current.
Q2/3:You are flashing the ROM (=Read Only Memory), where the OS files reside. Flash (=update) and you use the RUU (ROM Update Utility) in the kitchen in conjunction with Activesync to transfer the ROM to the phone. Because of the kitchen, you can also place other programs as well. Because it is ROM, you can't change this file by file (e.g. like a PC OS upgrade). You have to reflash the entire ROM.
Q4: Not likely to brick although at times you may think it is. Take special note of your bootloader version (v2.05 is especially bad). Most problems arise with a ROM that is too big (e.g. you specified too many items while cooking) and you get stuck at various pre-boot stages on the phone. Just keep reading on all the problems and get an idea of the terminology so that you can describe it here. It has most likely been observed already so check the stickies in the main Apache forum. Check out the tutorials. Just do a search for "tutorial". Hope this helps.
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taken from second last page of this thread
http://forum.ppcgeeks.com/showthread.php?t=7671
hope this helps you, it sure did for me.