you can download the origional stock firmware here

http://arnovatech.com/support/updates.html?country=gb&lang=en&p=2

and install it by

1. Download the update file for your device « update.img ». You can save it to the desktop of your computer for example.

2. Connect the USB cable to your Arnova and your computer so that the ARNOVA is seen as an external hard drive (as normal).

3. Copy the « update.img » to the root of the device. Do not place it into any folder of the Arnova, just to the root level of the device.

4. Unplug your device safely as usual using the green « disconnect safely » arrow in the system tray.

5. The Arnova will find the update automatically and display a message box offering to install this new firmware. Before tapping on "Install", you need to connect the charger/adapter DC-IN to your device. The Arnova will find the update automatically and display a message box offering to install this new firmware. Before tapping on "Install", make sure you connect the charger/adapter to the DC-IN of your device.

Important warning: Upgrading your device's software will reset all your settings (including the WiFi settings).

6. Once the firmware update process is completed, your Arnova tablet will automatically restart. You must then go though the installation wizard. Not only will this process allow you to configure the basic settings of your player.

its quite simple if your friend soldit to you because of this reason they were quite silly 😛