Downgrading WM6 to WM5

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I had my HTC wiza200 unlocked (SIM & CID)..it was Tmobile.and did upgrade to WM6 from instructions from this site..but it was not fast enough....even though it was OK reception wise and thrz no heavy battery drain...now i want to downgrade back to WM5...any help will be appreciated,Thanks in advance.
Current ROM:
IPL:3.08
SPL:3.08
Radio:02.47.11
OS:11.0.1.0

Simply install your oem carrier rom. Your tmobile so that should be 2.26. just download it and install it. Thats it.

Jeff

can u direct me to link to get it?
"oem carrier rom. tmobile"

Current ROM:
IPL:3.08
SPL:3.08
Radio:02.47.11
OS:11.0.1.0
Location:INDIA (Calicut)

Near the middle (G3.7) of the 1st post in this thread you will find the Tmobile 2.26 rom.

Jeff

http://forum.xda-developers.com/showthread.php?t=298613

Huh...Thanks a lot for ur prompt reply !! will try...THANKS again !!

am downloading it right now..
do i need to format (is this hard reset?)..i want a clean install with no left overs from previous installations !!
\sorry for new bee questions !!

Whenever you flash a carrier rom you have a fresh install. Carrier roms are the equivalent to formatting your hd and reinstalling a fresh copy of the os.

even the IPL/SPL and radio will go to carrier ? or just the OS ?
Current ROM:
IPL:3.08
SPL:3.08
Radio:02.47.11
OS:11.0.1.0
Location:INDIA (Calicut)