Jack JK-T781E Series - User Mode Parameter Modification

5、Enter user mode and modify & save(1-10)
In normal case,
press F to get into
user parameter mode.
Press up and
down key to change
parameter items.
Press enter key to
get the value of this
parameter.
Press up and down
key to modify the
parameter value.
Press F key to get out
of this mode.
Press enter key to
save the value