I have a clear question about ESIM and Factory Reset.
If I Factory Reset the phone from Settings > Reset menu I have the option to either Retain or Remove ESIM installed.
What If I Factory Reset from the recovery menu? Will it remove or retain the ESIM? If retained, can it be used without any authentication?
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As far as the ESIM question on retaining the ESIM info and being able to use it without rej-authentication, that query should go to your phone carrier.