Em happy to see that your problem is solved .. but here is another link of a custom rom.. only if you managed to install cwm
[ROM][4.1.2] Nexus1 for Walton Primo N1/ Gionee Gpad G2/ Allview P5 Qmax/ GN810 - xda-developers
P.S. As per in my previous link author already said that network will not work... So in this rom
What works:
Both SIM (3G on SIM1)
USB Tethering
All sensors
Sound
Camera [Both] [1mp]
What doesn't works:
Wifi, Bluetooth
MIC
Camera Autofocus
etc ....