This post is to teach you how to downgrade back from 2.3 to stock 2.1.
You will need this KDZ Updater CarphoneWarehouse Unlocked.zip Credits to dudeman1996
you will also need fastboot on your PC .
first you should use your KDZ updater ,browse for "V20B_00+Fastboot.kdz"file after that go to...
I'm sorry if this question was already posted , I upgrade my GT540 to 2.3.7 Cyanmod and its Sim Tool Kit is not working ,is there a fix in this problem ? sorry for bad english , thanks in advance !:):):):):):):)
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