http://www.arctablet.com/blog/forum/arnova-9-g2/arnova-9-g2-android-4-0-ics-custom-firmware-with-google-play/
http://www.arctablet.com/blog/forum/arnova-9-g2/arnova-9g2-custom-firmware-upgrade-to-android-40-ics-google-play-full-root-and-face-unlock/

here you will find information on how to uphrade your tablet to ics

rockchip is a program that can be used in windows
there are no explanation in the video.

1) Get the firmware unpack it on your pc – somewhere you can easily access it
2) Get your device in recovery mode. Depending on your device there is different ways:
a) The flashing requires a USB connection between the Arnova and your PC. So plug in your micro/mini USB
b) Shutdown your device. It seems to make things easier if it is off.
c) For my Arnova 9 G2 I have to press Power and Menu button simultaneously. While holding the two buttons press the reset
button with a small pin. Continue to hold the Power and Menu button. (I do not know for how long you have to hold it so – I have held them for quite a while)
3) Windows should now tell you that an unknown device has been connected – BINGO. If the Arnova screen appears you gave done something wrong !
4) Depending on which windows you run you will have to install the respective usb driver for flashing. For me the quickest way was to go to -> Control-Panel -> System -> Device-Manager. You should now see the device with the yellow warning sign. Tell windows to provide your own driver for it through the "drivers" folder of the downloaded firmware directory. Once the install is complete windows will tell you that you have a new device attached. If you run into problems here have a look at the following thread which explains the rockchip flasher tool which is behind this:http://www.arctablet.com/blog/featured/flashing-arnova-g2-rockchip-2918-rockchip-flashing-tool/

5) Now to the actual flashing. Right-click the RK29Update.exe file. The context menu opens. Click on run as administrator. In the bottom line of the opening windows it should tell you "Found RKAndroid…." – if you get a "No Found RKAndroid" you have done something wrong. Go back to step 2.
6) Make sure the "Loader" tick-box is activated and "check the remove IDB" box,press run. Wait till the flashing is done. The tablet should reboot automatically.

Done ! Happy Flashing

read the forums, you will find everything you need.