I can think of two easy ways:
- sz it to your computer, edit it there, rz it back to empeg. Use editor that can keep Unix EOL characters (LF (ctrl-J), as opposed to DOS/Win CR LF (ctrl-M ctrl-J)).
- Load developer image. Connect via serial, drop to shell. cd to appropriate directory, type

cat > config.ini

(type carefully yout config.ini)

(finish with ctrl-D)