Aïe ... no more SIM card after update
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@cr9c I encountered the issue with missing cellular network sometimes after a reboot on low battery. The solution was, to let it charge some time and then do a reboot.
Maybe the cellular chip is not getting enough power on very low battery, while booting... -
Thanks @luksus.
So with your explanation it seems to me clearest.
I'll try to test this fact and will come back to you.