My device shuts down after a few minutes of processing when I run "tar cf - . | tar xfp - -C /mnt/n900sd".

Isn't there a way to directly extract the image to the dedicated partition using a Linux computer?

I tried extracting the .lzma into /dev/mmcblk0p4 (dedicated ext3 partition created on eMMC). After that, I checked that everything was OK by mounting /dev/mmcblk0p4 into /mnt/test and the .ext2 image was actually there.

I modified the /home/user/.chroot file to specify the dedicated partition and filesystem (I tried both ext3 and ext2). However, nothing works. When I launch chroot from the shortcut icon, I get an error message stating "mounting failure". What is wrong?

My dedicated partition is sized to almost 3 Go.

Thanks in advance for your help.