Hi @CostasD ----- Thank you for the report and sharing your observations with us. Sorry to hear of the troubles.
Upon reading this thread I did a bit of searching around as I do not have one of these units in front of me to test with and it seems based on this thread other users have experienced the same/similar issue(s) while using The Allo BOSS under DietPi.
However, another user chimed in on the same thread and mentioned the RoPieee should support DoP With the “Boss”.
-Eric