FOR X6 tablet:
Link for downloading:
Is is on your own risk!
DO THIS WITH FULLY CHARGED DEVICE!
1) Download file and place it on clear TF card, then put card into tablet
2) Power on tablet, when boot screen appears then hold volume button
3) Unhold volume button when upgrade screen appears
4) Tablet will automatically start updating procedure (it takes about 5 minutes)
DO NOT POWER OFF TABLET WHEN UPDATING GOES.
If updating not started then try to rename file to update_24822.zip