DM520HD : OpenDroid 6.7 (February 16th 2019) by Japhar for OpenDroid Team
opendroid-6.7-dm520-20190216.rootfs.tar.xz

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Link Japhar Sim : 
http://downloadcenter.japhar.net/dreambox/opendroid/Japhar/opendroid-6.7-dm520-20190216_Japhar.rar


Link Original : 
http://downloadcenter.japhar.net/dreambox/opendroid/Original/opendroid-6.7-dm520-20190216.rar