Even better you could just change the PHP file so that you don't have to keep manually editing the mg_custom_mode_sp20 file...
Old code
Code:
New code
Code:
You can find this in /var/www/SP2x/settings.php around line 312 in Sp20 firmware version 2.5.27.. or you could probably just search the file for fan_speed_select.
Careful though. Everything in the www folder is not persistent between reboots. Looks like one needs to modify more than the php files to make it persistent. The configuration files in /etc, however, are persistent.