This modification is intended for use with the Yaesu FT767GX when equipped with the optional 2 Meter module. It appears that Yaesu has the 2 Meter module default to Japanese 2M freqs (144.000-145.9999MHz). After using the backup switch to reset memories on the 767, the 2M module will also reset to default. To restore full US 2M band coverage (144.0000-147.9999MHz), follow this procedure: 1) place "backup" switch on rear panel to OFF position 2) power OFF radio 3) hold down "2" key and power ON radio 4) return backup switch to ON position Although I can't imagine that you could possibly break your radio with this mod, standard disclaimers for radio modifications apply.