I can't update my norde.
Did you tried to reboot your phone?
Try the suggestions from OnePlus Community Expert @the_o2 in the link below.
OTA update failed - installation problem
Still can't update
Download and install Oxygen Updater from the Google Play Store, link provided below. Choose the incremental update available for your device. (read and follow the steps)
Did that still nothing works.
Backup all your data to a laptop/PC/Hard drive/cloud first then factory reset your device. Then take the full update on your phone using the Oxygen Updater app.
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