I can't find the factory-reset instructions for a device with this specific name. Arnova's devices are named in confusing ways, so perhaps several names are used for the same device in different markets. But can you find a pinhole somewhere at the botton of your device? It should be on the left. Does it say "reset"? Then insert a paperclip and see what happens.
If that doesn't work, you could try the instructions on Arnova's support page:
"If your tablet freezes often or if you get error messages during the start up of your tablet, you can use the recovery mode to reset your tablet to its factory settings, removing all installed applications as well as any data or content.
Your tablet must be up to date with the latest firmware – downloadable from the downloads area of this website.
To access Recovery mode on the ARNOVA 10bG3
To access to the recovery mode:
Hold down the volume button + and press the ON/OFF button.
Once the boot logo ARNOVA is displayed, release the volume button +.
The ANDROID green robot is displayed.
- Once the ANDROID green robot is displayed, press simultaneously the volume button + and the ON/OFF button.
The Android system recovery screen is displayed.
a. Use the volume buttons to navigate
b. Use the ON/OFF button to select an option
To restore the default parameters of your tablet:
In the Android system recovery, select Wipe data/factory reset;
Select Yes –delete all user data.
Select Reboot system now.
Your tablet reboots. Redefine your parameters through the wizard.
Your tablet is restored to its default settings.
To access Recovery mode on the ARNOVA 9G3
To access to the recovery mode:
Hold down the Home button and press the ON/OFF button.
Once the ARNOVA boot logo is displayed, release the Home button.
The ANDROID green robot is displayed.
- Once the ANDROID green robot is displayed, press simultaneously the volume button + and the ON/OFF button.
The Android system recovery screen is displayed.
a. Use the volume buttons to navigate
b. Use the ON/OFF button to select an option
To restore the default parameters of your tablet:
In the Android system recovery, select Wipe data/factory reset;
Select Yes –delete all user data.
Select Reboot system now.
Your tablet reboots. Redefine your parameters through the wizard.
Your tablet is restored to its default settings.
To access Recovery mode on the ARNOVA 8cG3/8bG3
To access to the recovery mode:
Hold down the volume button – and press the ON/OFF button.
Once the boot logo ARNOVA is displayed, release the volume button –.
The ANDROID green robot is displayed.
- Once the ANDROID green robot is displayed, press simultaneously the volume button + and the ON/OFF button.
The Android system recovery screen is displayed.
a. Use the volume buttons to navigate
b. Use the ON/OFF button to select an option"