managed to upgrade the firmware 2.004
you need to shutdown and remove the battery else the unit will powerup back on if you insert the SD card..
and the system will not update..my previous version 2.003
So this is the procedure for me..
shutdown and removed the battery. Insert the SD card with the new firmware..
install the battery and follow the procedure
While pressing the HOME button, hold the Power key up until the HM-901 is power on. After the screen is on, release the power key. Then release the HOME button until the hifiman logo disappears. Now the player will be in recovery mode....
Yes, and I also found I needed to go into the menu and do a total shut down and restart and then everything worked.