This is all I got on this mod. Looks like a software mod and not a hardware mod.
HI.
The folowing procedure expands TX 136 - 174 MHz.
FT-25 EXPAND TX
Turn radio OFF
Press and hold ptt and Tcall (under the ptt) Turn radio ON Relase the buttons insert this number 22406665
The radio reboots and TX is enpanded!
Tested on Dec. 15, 2017 by IK0IXI
This is all I got on this mod. Looks like a software mod and not a hardware mod.
Tried w/o success. When turned on while holding buttons as noted,
screen defaults to the Preferred Operating Mode screen where I am unable to enter the 8 digit number.