Sony ericsson z550i white display solution - Sony Ericsson Z550i Cellular Phone

SOURCE: antivirus for z550i

kaspersky in jar fomat

SOURCE: Sony Ericsson Z550i Bluetooth

change blue tooth ic

SOURCE: folder lock for sony ericsson z550i

 this is your solution nirma. 
http://gallery.mobile9.com/f/23259/

SOURCE: download software

Just look in some torrentz sites
or look in sony erricsons site or look in mobile9.com

SOURCE: my sony-ericsson z550i display says no network and no coverage ar

go to settings-->phone-->network, try selecting the manual network option, if its able to find a network, you can request register on it, once back to main screen select "automatic" in network so you don't have to search your provider network everytime you loose signals.