Sorry to thread bump, but the fix if you are stuck on "searching for upgrades":
Go to privacy -> turn off Remote Software Upgrade
It should now say 'deactivated' on the RSU screen
Do a head unit reset ( hold power for 30 s)
Go to privacy -> turn on Remote Software Upgrade.
Let car go to sleep.
Next time you get into your car, you'll be able to press the button manually again.
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