Firmware suffix letter codes

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Oh Yeah!!! Thanks to some interesting info regarding firmware "regions" and filenames from dfkt; where he noted that the A & E FW are identical - I proposed maybe, ahh, checking some OTHER letters - so I have done that, and discovered what the letter codes mean...

m300*.bin; where * =

A = Americas. Radio, volume high
E = Europe. No radio, volume normal
F = France? Starts after upgrade with Language selection, radio, volume normal
G = Hebrew, no radio, volume normal (NO Arabic language choice)
H = Hebrew. with radio, else same as G
M = Arabic, no radio, volume normal (NO Hebrew language choice)
N = Arabic, with radio, else same as M
P = starts with language choice, radio, volume high, and forces MSC mode.
S = language prompt, no radio, volume high

And now, for the Holy Grail. Try this AT YOUR OWN RISK and don't blame me if something goes wrong

T = TEST MODE

No other letters, including the rest all the way through "Z", do anything.

The Secret - after renaming the .20 FW file to m300t.bin and placing it on your Clip, go to the Settings menu, scroll down, umm, what's this?? A Diagnosis option??

Note that after running through the Diagnostics when not plugged in, the Clip comes back at next power up in USB Auto mode.

Nothing else seems to be any different from the "A" feature set.