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Windows Central Question i want to update my nokia lumia 520 to 8.1 through PC ? is there any software for this if there please tell me dear
PC Suite does not work with Windows Phone. Updates are only Over The Air... OTA.
You can update your phone via PC, however, it wipes your phone completely clean.
FAQ - How can I recover/reset/restore my phone software? - Microsoft - USA
I'd recommend backing up prior to using this and only do this if you're not worried about possible information loss.