Configure phfont files

After we edit the phfont files by hand, such as ‘fontopts’, ‘fontmap’, ‘fontpreferred’, what should be the next steps ? restarting ‘phfont’, even rebooting QNX, the font stays the same.
Whenever ‘fontadmin’ runs, these are the three files it modifies, and QNX changes the font correctly according to the ‘fontpreferred’ file.