Firmware EMG4 and later all require efs v2 format for the IMEI number to be read, by updating to 4.3 you now have v2 and cannot use a firmware earlier than EMG4, otherwise your efs (and IMEI) will be corrupted.
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Note: This quote doesn't automatically apply to everyone, decide for yourself if it might apply to you.
Originally Posted by justruss
What has this place become?
It's essentially a few people graciously answering the same repeating of immature, lazy, demanding questions from the masses.
Nobody searches. Nobody reads the first posts or titles of threads. Nobody even looks at posts a couple above their own.