This is not an official firmware! (but you can see lots of full videos with it on YouTube) (Be aware you lost your warranty)
Firstly you have to take a look your boot code of your media player. On main screen press stop and after that play button and on the screen you can see the boot code, for example: 0202.0018. If the boot code is earlier than 18 you have to update it with this link:
Go to the next link:
http://moservices.googlecode.com/files/ ... icon_4.zip
After that amp_r11_icon_4.zip file downloaded, put it on a pendrive, pull out the power cable of the media player, plug the pendrive in the usb port, push the reset button on the side of the player hold it and plug the power cable into the player. Leave the reset button. Wait and the player will upgrade the bootcode.
You are ready to use your media player, go with your PC web browser to the link of you player, maybe 192.168.0.155 (but you can see this ip address in you router, under DHCP settings or on the main screen of media player). Find the YouTube on the page and click on it to refresh. The YouTube will ready to be working...