Update android on android box.

[fus10n]

I have a few android boxes that i'd love to install a newer version of android on. I have a droidsmart i86 with android 5.11, and another to boxes with android 6.

I'd really like to try and get the droidsmart one updated as that has inbuilt bluetooth while the other 2 don't. 2nd question, can i get bluetooth dongle to work on the other 2 boxes?

Thanks