[Stan]

No idea about Samsung 12.2 but my recommendation, assuming the tablet currently does what you want, is to just keep using it as is.

Why?
1) Changing the OS could cause a problem that will be difficult to fix (necessitating a new tablet or a reinstall of Android 5)
2) Upgrading from Android 5 to 12 is skipping several versions (your tablet was released in 2014 and there is a good chance that 12 doesn't support it)
3) The longer you wait, the more chance that someone else will try this upgrade and discover/post any problems.
4) The longer you wait, the more likely it is that a newer, more desirable replacement tablet will be produced (and hopefully cheaper than current prices).
5) You could be playing music (instead of pratting around with the tablet!)

The only real issue I foresee is if your tablet automatically updates the OS and stops working - change the settings so that it won't update the OS without your consent.

Also, make sure that you make an offline backup once week (I use the Companion to backup to my Windows 10 desktop).
Should the worst happen, you will have something recent that you could download to a new device

Hope this helps

Geoff

Thanks Geoff,
I do agree with you on all points. My tablet is working perfectly and I do backups.
Cheers
Stan