I set it to 'reset all' mode not on purpose and after that I had a problem with my network coverage because it always show 'emergency call only' I have tried network search mode on 'auto' and 'manual' but result still the same. I've even changed the attenna but still do no good.
Try to Upgrade your Firmware using Sony Erricsson Update Service for easy ways.
just
download and install Sony Erricsson Update Service,Connect your phone
to Computer using data cable,and Sony Erricsson Update Service will
found and upgrade your phone firmware automaticly.
you can try download Sony Erricsson Update Service from SonyErricsson Oficial Site.
and you can found The Tutorial for using Sony Erricsson Update service in HERE
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