The "avm_kernel_image" extractor does not work

[maringuu]

I have not inspected the problem very thoroughly, but in short it does not work because something in the freetz-ng installation fails.
To get the freetz unpacker working without the fact_extractor you have to do:

# These variables instruct freetz to use the system versions of lzma and sfk
export UNLZMA=$(which lzma) 
# http://stahlworks.com/dev/swiss-file-knife.html
export SFK=$(which sfk)
tools/unpack-kernel -u kernel.img

[jstucke]

there was a fix for the missing sfk binary in #140, so it should hopefully work now. Can you check?