i m from pakistan too and it works fine i m using it.
i also have iphone 3g 2.2.1.
use winscp to replace file and restart if it shud work.

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iPhone 3G 16GB
2.0-->2.01-->2.1

Jail breaked and S/W Unlock
Used X-SIM Works Great.
Dev Team Great Work

Core2Quad 2.4Ghz
Corsair 800 Bus Speed 2GB RAM
ASUS DVD Writer
250GB HDD