Well I'm sorry to bother but I did read but it does not work doing exactly as intended. I have followed these steps:
Download the firmware (make sure it is called upgrade.bin).----> downloaded 2.7
SCP the upgrade.bin to /tmp/upgrade.bin----> (already did this part)
Execute sysupgrade -n -v /tmp/upgrade.bin
Wait for reboot. Done. From now on your MK4 can be treated as a normal MK4.
I am very very newbie and trying to learn linux. The trouble I have run into is sysupgrade in Backtrack 5, honestly don't know how to do this part cause this OS does not have that command (how the hell do I run that code in the shell?), do I have to get somewhere else? That's why I asked for help cause i'm stuck. Could you be kind and explain this step for me, like doing it for an idiot.. Thank you, merry christmas.