Rockchip RK2918 (ARM Cortex A8) clocked at 1 GHz. Memory: 1 GB of RAM.
These are often found in community-maintained archives. Internet Archive hosts some older Arnova documentation and files. Arnova 10d G3 Firmware Rom
Understanding your hardware is the first step before attempting to flash a new ROM. The Arnova 10d G3 Rockchip RK2918 (ARM Cortex A8) clocked at 1 GHz