I ended up just using the "secret menu" in this cheapo satfinder (like $38 on aliexpress, sometimes cheaper) to open and export the softcam.key from it, and those "auto ecm keys" are all it has from the factory, and they're just PV keys from what I can tell, I think EMM but if not, I guess it just tries all of those in sequence?
It has the ability to accept more keys, but just this setup is somehow enough for it to autoroll, so I suspect that list may be known "common" and default keys pehaps, considering they're using 0000 for all of them, with a slot 0 and slot 1? Format is weird:
CodeDisplay More#*#*#*#*#*#*#*#*#*#*# Auto ECM Key #*#*#*#*#*#*#*#*#*#*# P 0000 00 9D64DB7E2D4E90;2330:04120:30000:V P 0000 01 A35D6C7CC2FBE1;2330:04120:30000:V P 0000 00 009077F728E1EF;2270:04180:30000:V P 0000 01 009077F728E1EF;2270:04180:30000:V P 0000 00 FD8A1A343A1BD0;2330:04080:29269:V P 0000 01 25281B3C220451;2330:04080:29269:V P 0000 00 2107DE0F85DD84;2330:04015:04444:V P 0000 01 986D39E3CB3424;2330:04015:04444:V P 0000 00 0F1BD579C4312E;2370:04053:17499:H P 0000 01 12179D780F8856;2370:04053:17499:H P 0000 00 178B5301892F90;0019:11730:30000:H P 0000 01 C40DCB63AABAE9;0019:11730:30000:H P 0000 00 5EA93E50196F49;2350:04160:30000:H P 0000 01 51BB1D53EF14A8;2350:04160:30000:H P 0000 00 AF38CBD5C28B14;2350:04159:30000:H P 0000 01 9F8299CE223620;2350:04159:30000:H P 0010 00 B0B8E34956A2D5;1830:03717:07500:H ; P 0010 01 248C2848BDCE79;1830:03717:07500:H ;
Those are ecm keys. If the handheld has emm keys they may be built in the emu and hidden but I am not sure.
#*#*#*#*#*#*#*#*#*#*# Auto ECM Key #*#*#*#*#*#*#*#*#*#*#
P 0000 00 9D64DB7E2D4E90;2330:04120:30000:V - ecm key0 for 123w transponder 4120 v 30000
P 0000 01 A35D6C7CC2FBE1;2330:04120:30000:V - ecm key1 for 123w transponder 4120 v 30000
P 0000 00 009077F728E1EF;2270:04180:30000:V
P 0000 01 009077F728E1EF;2270:04180:30000:V
P 0000 00 FD8A1A343A1BD0;2330:04080:29269:V - ecm key0 for 127w transponder 4080 v 29270
P 0000 01 25281B3C220451;2330:04080:29269:V - ecm key1 for 127w transponder 4080 v 29270
P 0000 00 2107DE0F85DD84;2330:04015:04444:V
P 0000 01 986D39E3CB3424;2330:04015:04444:V
P 0000 00 0F1BD579C4312E;2370:04053:17499:H
P 0000 01 12179D780F8856;2370:04053:17499:H
P 0000 00 178B5301892F90;0019:11730:30000:H
P 0000 01 C40DCB63AABAE9;0019:11730:30000:H
P 0000 00 5EA93E50196F49;2350:04160:30000:H
P 0000 01 51BB1D53EF14A8;2350:04160:30000:H
P 0000 00 AF38CBD5C28B14;2350:04159:30000:H
P 0000 01 9F8299CE223620;2350:04159:30000:H
P 0010 00 B0B8E34956A2D5;1830:03717:07500:H ;
P 0010 01 248C2848BDCE79;1830:03717:07500:H ;