Mine itīs (was) exactly the same
Cubot advised me to select "Firmware Upgrade" instead "Format all + Download" or "Download all"
and after upgrade to KK 4.4.2 all itīs working perfectly fine.
Yes, and you can download
1) A rooted (and ready to FlashTools) 4.2.2 v1.1 from here : http://www.4shared.com/rar/0_t0Pt2Sb...p_141113-.html
2) USB Drivers from here : http://www.4shared.com/rar/pfDlArtjc...sbAll_092.html
3) Flash Tools from here: http://www.4shared.com/rar/EPAwXs9Ec...6589-6592.html
4) KitKat 4.4.2 Original Stock Rom from here : http://pan.baidu.com/s/1hcjFo
Please note that this rom ONLY WILL work fine for this build number : G807_C1_D1_CUBOT_V1.1_20140613 and Custom build version : 1402651330
And donīt forget: to flash the new rom select "Firmware Upgrade" option and wait, process can take several minutes.
To root Kitkat 4.4.2 you can use KingoRoot (worked fine for me). Framaroot does not work with KK 4.4.2
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