hello i have an evotab tb1 which is only a opad n2 rebranded to be selled in the eu, i found already 3 rebrands of this mid but neither have support. i updated my mid from 2.1 to 2.2 but now my sound is dead, i can't hear a thing neither from the speakers or the headphones, and the volume in the mid is at maximum, and another issue is the wifi, when i try to start it it say: ERROR. can someone please help me with a proper rom that makes the sound work and the wifi? it is a rk2818 based with 4gb and 256 ram memory, with trackball 7" capacitive screen. thank you.