So, being on 2.2 for a couple of days, I'm very satisfied till now. Battery life is great, today I've been off charger for 4 hours, 2 hours Screen-on-time and got 79% left. Memory management is awesome, my games rarely ever restart after doing oth...
You can try checking the bill of his S8. I bought my S8 on contract in a local retail store and got a bill, that included the IMEI.
EDIT: I just checked, the IMEI can also be found imprinted on the rear glass on the bottom.
Are you sure, the IMEI displayed is correct? Because it sounds like an IMEI brick, my old Galaxy S3 had the same issue.
It's IMEI became a generic one, that didn't match the original one on the box.