first of all, a disclaimer:
I know it's stupid to fiddle with a device you can't restore. I hope you know it too.
So, whatever you do, you're completely on your own.
But please go on, sp we can learn how iRex technologies handles bricked iliads.
step 1:
you use the iliadhack to get permanent network connection.
step 2:
you make an ssh connection to the iliad with the login root and no password
step 3:
you add a line to the startup script in the home directory which says
/usr/bin/wired.sh start
to make sure it will start the network connection every time it boots (not required, but useful in case the gui doesn't work anymore)
step 4:
you get the packages with
wget http://<and so on>.ipk
step 5:
install it with
ipkg install <filename>
(you can do ipkg -test install <filename> to check first)
step 6:
now you can use the program by typing xrandr (or whatever you installed)
if you want to start a program with gui you usually need to add a "--diplay :0" or something like this to make it appear on the iliad screen
repeat 4-6 as necessary till you've got installed everything you want to install (or there's no space left)
some recommendations:
do NOT overwrite already installed packages, if iRex modified them you might run into serious problems
do NOT move/delete files directly, uninstall packages by ipkg remove <name>
packages from 3.5.3 seem to work well, 3.5.4 updated some libraries and causes some dependency problems
learn how to use vi before you edit files, not while you do it
pray and have fun =)