I am unable to start the update
Unable to access the download and update button
iPad Pro, iPadOS 14
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To perform an update procedure wirelessly, you need to connect your device to a reliable and fast Wifi Network with internet access (no cellular data, no personal hotspot, no VPN connections are admitted).
AND your iPad should be plugged into power during the whole update process.
Do not forget to create a full backup of your device, before any updates.
Regards
Giulio