read your current frm and make a backup of the TRC file.
plug in your new frm2 and make a backup of the TRC.
compare the two files using http://www.comparemyfiles.com/
Program your new one based on values of your old one (the ones that are present)
That's how I programmed my FRM when I replaced it about a year ago. I went from defective FRM1 to FRM1
enjoy your new available mods in frm2