Please check what baseband is installed now, what region your phone is from, and if your IMEI is still listed correctly. I'd like to list the first 2 but not the IMEI, obviously, just5 whether it's still there after you restored the stock rom. If not, that's other mess. And the region matters because certain Samsung phones act weird with basebands and other files from different ones even though it is from the same system update version.
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