trying to install media portal on a dreambox 800 HDpvr

used putty to login on dreambox
image is on the dreambox in tmp map
cd succesfully to map to do install
install fails because of 8mb flash remaining

installed flash expander
usb drive formatted to EXT4 with Gparted under ubuntu
flash expander sees the drives but upon aktivation it crashes and with it the entire image goes into a reboot
i tried this with both a 4gig usb drive and a 150mb drive
same result
what am i missing here ?

btw image is 4.0.12

do you know a list of things i can safely remove to get past the install limit
basically i only install CIFFS with SAMBA to be able to view movie,s from my WDcloud
and i like my WEBradio

and i guess otherwise a new DM820 is in order!