These are often found in community-maintained archives. Internet Archive hosts some older Arnova documentation and files.
Standard Arnova firmware often lacked official Google Play access. Many community ROMs were designed specifically to inject Google services onto the device. How to Flash Arnova 10d G3 Firmware Because the Arnova 10d G3 Firmware Rom
uses a Rockchip processor, the flashing process requires specialized tools. 1. Required Tools Tablet won't boot up - Arnova 10d G3 - iFixit These are often found in community-maintained archives
Official support for Arnova tablets has largely diminished, making third-party repositories the primary source for firmware. Arnova 10d G3 Firmware Rom