Yes, you can change your box into a Japhar Sim box,

You need to remove carefully the "chip" that you can see on the photo (unsoldering it), and then solder the sim support. Then you can insert the Japhar Sim in the DM520HD box.

Chip to be removed :



Solder the Sim Support/socket, you find here,

https://jam3.japhar.com/japhar/index.php/product/sim-socket/

And then the sim can be installed, that you can find here,

https://jam3.japhar.com/japhar/index.php/product/dm520hd-nc3-japhar/

Hope this helps and to be enough clear,

TS
_________________________
DM8000, DM800se, DM500HD, DM800HD, DM7025, DM7020s, DM7000, DM500s
VU+ Solo, VU+ Uno, VU+ Duo, Kathrein UFS910
Tivusat, TNTSat, Fransat, SSR/TSR, BBC1-2-3/ITV
DE-OpenBlackHole 1.4 image : http://www.openblackhole.com/