stock firmware from a
velocap hdmi recorder.
board version
YK928R  Ver1.0(20150813)
hit me on 
www.youtube.com/bangs6996


I have included my firmware you can try to copy both to a usb thumb drive and turn it on.
give it about 20 minutes..      If you find other firmware on the net just 
try to rename file to: jedi.img
and place on root of usb.
You can also try to rename it to:    any_hd.ahx



Alternativly you can snoop the hex looking for jedi or boot file key words may give hints on file naming
example of code 
JEDI_.9910_Ya