Jack JK-T781E Series - System Officer Mode Access

7、System officer mode-limited to item（26-27）
Press F and
enter key
and at the
same time
boot the
machine up
Press up key to
find
P26 (speed
limit) and the
press ENTER to
get the value.
Press F key to
get out of this
mode.
Press up and down
key to modify the
parameter value
and then press
enter to save.