I upgraded my DG4102 from fw 1.08 to fw 1.14, but the upgrade was different from the attached upgrade document.
I had, fw 1.08 and bootloader 0.4,
(for new readers, the bootloader version is on the system info page, under keyboard version !?!?)
First i had to find a working USB stick i have several, a 256Mb did not work a 2 GB older type did work with FAT32.
I tried to change fw first without loading a new bootloader, to see waht happens,(nothing)
sometimes it did nothing and utility and store button stay on.
and sometimes all kind of buttons began to flikker, nice, but nothing worse happens.
Later i discovered that it had to do someting with the setting save last powerOn.
So i updated the bootloader, the file is only 166Kb, it took several minutes of flikkering utility button,
then suddenly the waveform buttons went on, and in a second later the unit rebooted by it self, but ..
no changes in the system info menu ??
So i turned the unit off and on again,...black screen !??, nothing, rebooted again
still nothing, then i noticed that the mod, utility and store button were on again.....
Loooks it was waiting for something, and could not load fw 1.08 with the new bootloader !!
Then i put the USB stick with the fw 1.14 in the unit and watched wath would happen.
The utitlity button began to flikker for lots of minutes...not much activity on the stick..
and then suddenly the ramp button light up, and the flikkering of utility stoped.
Well, slowly all waveform buttons lights went on....and finally it rebooted by it self,
and a happy end, all worked oke.
So the attached file is not correct, in my case, between loading bootloader and fw.