Disclaimer

I'm not responsible for any damage of your device or loose of data asresult of this article. 

Preparation

  • Backup all your data! Everything will be erased from the tablet!
  • Download twrp-{version}-espresso3g.img
  • Download ua_espresso3g-{version}-{timestamp}.zip
  • Download Google Apps (ARM / 7.1 / Pico)
  • Download & install heimdall (Windows) or look into your repository (Linux)

Install new recovery image (teamwin)

  1. Power off
  2. Vol.Up (right) & Power for 5 seconds -> Download mode
  3. Confirm
  4. Command line (Windows) or Terminal (Linux): heimdall print-pit
  5. Power off
  6. Vol.Up (right) & Power for 5 seconds -> Download mode
  7. Confirm
  8. Command line (Windows) or Terminal (Linux): heimdall flash --RECOVERY twrp-{version}-espresso3g.img --no-reboot
  9. Power off

Install new firmware

  1. Vol.Down (left) & Power for 5 seconds -> Recovery mode
  2. Wipe
  3. Install
  4. ua_espresso3g-{version}-{timestamp}.zip
  5. Reboot after flash
  6. Swipe to confirm flashing

Configure your tablet

  • WLAN on
  • Bluetooth off
  • Location off
  • Language

Install Google Play

  1. Power off
  2. Vol.Down (left) & Power for 5 seconds -> Recovery mode
  3. Install
  4. open_gapps-{architecture}-{version}-{package}-{timestamp}.zip
  5. Reboot after flash
  6. Swipe to confirm flashing

Install now your apps using Google Play ... FINISH