Can't install unsigned apk, it say:
INSTALL_PARSE_FAILED_NO_CERTIFICATES: Failed to collect certificates from /data/app/vmdl1537636787.tmp/y_com.goatgames.dhs.ap.gp_1.1.6_mod_unsigned.apk: Package /data/app/vmdl1537636787.tmp/y_com.goatgames.dhs.ap.gp_1.1.6_mod_unsigned.apk has no certificates at entry stamp-cert-sha256