I have a Galaxy S10+ (SM-G975U) with an AT&T sim card, and since I have purchased the phone from Ebay (new), it hasn't updated when I go to Settings>Software Update, as it continously tells me "Current software is up to date", but when I go to Settings>About Phone>Software Information, it shows my android version is 9, and my baseband version is G975USQS2BSI4... so isn't my phone supposed to be android version 11 now, and a different baseband version as of 08June2021? My Android Security Patch Level is dated September 1st 2019 as well, everything seems to be dated 2019 still, and since I have had the phone since May of 2020, shouldn't I be seeing new updates by now? I have tried for months, but it keeps just telling me "Current software is up to date" every single time I check, with never any changes happening. Help me please! P.S. I am in the USA using AT&T as my provider, which I can't get any help over on their website trouble shooting, as my phone just says everything is fine. Thank you in advance, I'm desperately concerned.