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The ICS update for xperia arc that has been rolled out gets downloaded half way to my pc by sony pc companion but then stops abruptly telling that the update couldnt get downloaded for installation!! my si no is 1246-7449. pls help!!
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Alternatives on How to backup Xperias
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just wait a bit longer
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
K let me check that out but are you sure that this update service would help me in some way!! may i know what i should do before hand!! thanks by the way!! 
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Don't forget to mark the Correct Answers & Helpful Answers