Disconnect AC mainsplug from Morgan's.
Connect nullmodem-cable (D9-D9 female) to Your PC and Morgan's.
Click "Open file" tab on Loader-program.
Select correct firmware (*.pgm) from Your PC.
Click "PC->STB" tab on Loader-program.
Connect Morgan's back to AC.
Firmware download starts automatically.
After successfully download, there should read "InSt" on Morgan's display.
After intallation there should read "End" on display.
Wait for a moment that receiver start itself.
If everything is ok, You have done update.
If not, try again with another *.pgm file.