Don't know what's up with himem.sys on the FM Towns. Maybe there's some switch we're missing or something...
Big thanks Barry, to get HIMEM.SYS to work.
The MS-DOS 6.2 L10 Bootdisk content a file called " setup2.exe ".
With this file it is possible to make the right settings for the himem.
The saved settings in CMOS RAM will be saved to NVRAM file.
I suggest to delete the old fmtowns.nv file before.