yaesu 100d

[WX9DX]

I have been wanting to see if there is a software flash upgrade to add the 5MHz freqs to my FT100D radio.

[N3ZKP]

Have you tried the obvious - asking Yaesu?

[NA9Q]

Unfortunately the FT100D does not use flash memory.  It is a one time programed device.  The only way to change the software is to change the device.  You can however, do a hardware mod to the FT100D to open it up for transmit on all frequencies.  This mod is described on many of the modification information sites.  one of them is here:

http://www.mods.dk/view.php?ArticleId=2981

Mike NA9Q