Need upgrade of firmware for Android Tablet

I currently bought 4 tablets Yuandao N12 with android 2.3 and GPS. The developer hasnt release a version for this tablet with android 4.0.3 or 4.1.1 I need someone that can upgrade the firmware to version 4.0.3 or even better to ANDROID 4.1.1 BUT the GPS and play store have to work properly. Here are the drivers: RK Processor n12 deluxe android 4.1.1 [login to view URL] n12 deluxe android 4.0.3 [login to view URL] A8 processor N12 deluxe firmware android 4.0.3 [login to view URL] N12 ORIGINAL GPS ANDROID 2.3 firmware with GPS [login to view URL] THE ORIGINAL PROCESSOR IS THE MODEL A8 with GPS and android 2.3 The webpage of the developer is: [login to view URL]