Error 10 means iOS version is ahead of what iTunes supports
since iOS 14 is in beta and not public you can’t update it
wait for public beta to be released
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connect your device to Mac /PC open iTunes
in device summary
restore your device it’ll download stable version of iOS 13 and it’ll restore your device to factory settings this process is not same as erasing all content
it worKed for me
iOS 14 is still not available for public so you can’t update to it
else
wait for next Dev beta it might fix issue