The issue here is that the new rytec sources uses only xz compressed packages (once you will have update with the correct download links if not already available in your release of crossepg), so you need to upgrade (various libraries/software) your image to have such new compression tool to work.

As an example, see this topic : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=14959#Post14959

and here,

http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=14963#Post14963

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