Can you upgrade your operating system on your tablet?

Will you be faced with buying a new tablet on major OS changes?

 

http://blogs.computerworld.com/19341/android_40_upgrade_list

I'll be researching a few tablets to see if Linux upgrades made by Telco's are not the upgrades you might want.

Or is it the off brands not getting the upgrades to keep the telco's version ahead of the pack?

If you're big into upgrading tablets and have information send it to me.