I second that request.
I called Vertex and they were tight lipped about it, first denying it, then I called back and selected amateur support and talked to a guy who was VERY knowlegeable about the VX-10's and said he knew it existed, but he feared consequences if he logged into LMR's system and emailed them to me. From what he said, it involved removing a solder pad on the logic board (similar to the mars/cap mod on the amateur version of the radio, the FT10/40). He also told me you lose some memory channels or some other functions but couldn't recall which ones.
I have a UHF VX-10 and would like to make it field programmable for use on the 440 band. It is a heck of a radio.