I had two note 10 plus devices. One have the latest software update but the other doesn't. I tried updating it manually but it says its up to date. I don't know how to fix this or is there any other way to update it?
Is the phone and SIM card from the same carrier? If not, you may have at&t or Verizon phone with another carrier's SIM card. If it's network unlocked, use Odin to manually update it or get a SIM card that is from the carrier that sold the phone and search for update.
Go into your datetime settings and set the date to a month into the future then check for software updates in settings. That should get it to update.