I keep a file made from the wiki here, forum posts, and Yahoo posts. What I saved about flex step is below. This may have been posted by Don Starr but I'm not sure.
Flex Step: "Super Expert Setting Menu". PGM, FUNC F3:GLOB Scroll down to
"flexStep" and Rt-Arrow it to "On" F1:Save. FlexStep allows entry of
frequencies that are a multiple of 1250 Hz except in the civil air band 108-136
where the step size is fixed at 8.333 kHz.