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Samsung and Other Manufacturers Disable Phones Bought on Gray Markets: A Consumer Nightmare
(nomadscrolls.net)
This is a most excellent place for technology news and articles.
There is indeed an Android 13 for the S2. :)
https://xdaforums.com/t/rom-unofficial-13-0-0-r11-i9100-lineageos-20-0-alpha.4507443/