Hello,

You need first to flash the Japhar SSL84J, then turn off the box, and replace the old A8P sim by the Japhar sim (check to be sure before it's for DM800HDse v1).

This done, you can turn on the box with the new sim in it, and install the image you want from the link below,

DM800HDse V1 Japhar Images : http://www.ourdreambox.com/ubbthreads.php?ubb=postlist&Board=48&page=1

Admin

P.S. : If you need to buy a Japhar sim for DM800HDse, you can find it below, see link : https://jam3.japhar.com/japhar/index.php/product/japhar-dm800se/