Just download the latest image from the support section here.
Code:
http://www.world-of-satellite.com/enigma2/openvix/index.php?dir=ET-9x00/
Unrar it and copy it to a FAT32 formatted usb stick.
Insert the USB stick at the front(disconnect any other USB's you're using for picons/swap/epg)
Start the box up using the back power switch and it'll show you on the LCD that an image update is available and do you want to update?
Hit the third button from the left "OK"
Let the box do the business and FFS don't switch it off while it's busy. It should eventually load to the setupwizard.
If your box doesn't recognize the image then you have an old bootloader and need to update it you can get it from the link below. You must only update the bootloader and not the image and bootloader at the same time! Updating the bootloader is the same as an image copy to usb etc.
Code:
http://www.et-view.com/main.php?board=ET9000/9200
They've made a lot of changes to VIX 3 so they don't recommend backing up all settings and restoring them, you can with some but to make sure you don't wreck anything, better to start from scratch.
Make a list of all plugins you use and what sat settings you have used for multi LNB's and also your network settings and such so you can set it all up quickly. You also need to have an .ipk of CCcam and any cccam.cfg file that you use ready so that you can install cccam again and get it working quickly again as they don't supply it from the feed!
As for driver updates they are included in the images themselves.
Hope this helps.