Yes, you can upgrade to the JAM 5.2, as this is the successor.

You can find all about here, on how to upgrade your image (in a "simple way"), by some commands.

See topic and commands related to the DE-OpenBlackHole 1.4 below.

http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=1377#Post1377

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