You can use PC for update and for that you need to download smart switch for mobile as well as pc. I am giving you link by which you download smart switch app.
1- you phone should connect with pc/laptop via Usb cable 2- you pc/laptop has separate internet connection not with phone whom you are updating 3- By opening the smart switch app in pc/laptop will show your mobile phone, there below that you can see if update available for your phone 4- If available, you can download and install
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