The way to do it, is to reset the BIOS, see below,

and to flash a new image. It will erase all Flash memory, loading the new clean image.

Erase BIOS : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=5234

Images, you can find the one for your sim, but for Japhar sim boxes (any box that was upgraded to Japhar Sim) you can find below.

Japhar images : http://www.ourdreambox.com/ubbthreads.php?ubb=postlist&Board=47&page=1

and these images are ONLY for Original boxes with A2P Sim : http://www.ourdreambox.com/ubbthreads.php?ubb=postlist&Board=104&page=1

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