to unlock my grundig tv, locked by a remote control?

Saw this on
http://service-mode.com/service-funai-11.html

"TV GRUNDIG P37- 060 CUC 6300
, locked.
Microprocessor XC88642P, remote control TP 770. The video processor STV2102. When you connect the screen are three keys . Tried codes 8500 and 7038 are not appropriate .
Advise how to unlock .
In the service menu ( hold the button on the remote ,, i,, and connect to the network ) does not come out .
Press (VOL +), (VOL-), then (CH-), (CH +) from the control .
Experienced again Vol +, Vol-, CH-, CH +, all gone

I THINK that means:

In the service menu ( hold the button on the remote "i" and connect to the network ) does not come out [does that mean nothing on the display???] .
Press (VOL +), (VOL-), then (CH-), (CH +) from the control .
Di it again [??] Vol +, Vol-, CH-, CH +, all gone.

It may be worth trying.

XXX
September 2016