Sorry to hear about all the people having problems and having to open there consoles so frequently. Thats no good. I had to open it once but I took my time knowing not to expect a very high amount of durability. Thankfully I learned my lesson with the sd card and havent had to open since. Just be careful and remember what it is your dissasembling. It is far from being made of nintendium...rofl.
Anyways, I have been trying to switch to the xperia play build.prop. I have skeltons custom rom based on the 1ghz ics official. I read your directions and have tried following them to what was my understanding a few times with no success or noticeable changes. If you or anyone else could walk me through it I would appreciate it. I dont understand what you meant by the system folder on the sd card. Android folder? Data folder inside that? I looked and couldnt find any file named build.prop on my system to replace with the new one.
Im not dumb, but this is probably a step above my knowledge level. This is my first android handheld that I have modified and am actually interested in. Before this my only experiance with handhelds was my modded Sony PSP.
As always, thanks to everyone here and for all your hard work and help. Without you, I would be sad face with 600mhz and original firmware.