Mine has been working fine since day one and i have not encountered any problems whatsoever. I can save and i can soft reset.
I am using G6Lite.
U-Disk Manager V4.6d (old but works fine for me)
G6 Manager?(the one loaded on my DS/G6) is also 4.6
I applied the Arm7 fix (even though i am not sure if it is needed or not)
I also believe the Arm7 fix technically trims the rom but i am not sure. I DID NOT select trim rom on the U-Disk Manager, just to be safe.
My settings for th U-Disk Manager were:
Software Reset
DoFAT - Force R/W
I agree that everyone should state which G6 Flash unit you are using Lite, Real whatever.
I am not sure what release i have. I just got a file with a generic name and no nfo.