Can I get some help with BTC Flame tablet info?

[AC Question]

btc flame tablet info

Hi im new here so thanx for any help in advance
I bought a cheap generic tablet from amazon :

Model Number : BTC
Android Version : 4.4.2
Kernel Version :3.4.0+
build number: full_gs702c_userdebug 4.4.2 KOT49H eng.root.20150105. 112232 release-keys

the problem is that it lets me configure my apn but when i save it there is no apn saved, (does not appear in apn list ) i have factory reset and run some apn apps but it still wont appear after i save it .
so i was thinking it may be a firmware fault ,

i looked around and it takes "Lollipop" . (tablet wont upgrade from settings ) (there is a "Owl" app to upgrade ) keeps saying server busy,

So question is am i able to download the latest Lollipop ( stock as in original untouched ) firmware and upgrade from the built in sd card and if so what Lollipop firmware would be best ,..

thanx again for any info cheers.

ps was also trying to run "Uniflash" but it wont run, dnt know how to post picture , but uniflash crashes after starting up and there is no options displayed just

" connect your smartphone via usb , and dont forget enable usb debug , which i have done .... thanx again