Jvc kd-x230 Radio - Dealing with 'Send Service Protect' Pop-up Inscription

Hello, I'm a freshman here and I need help, I bought on all radio in the auction, the guest sent trying to plug in and at the start
Send service protect - what's going on? Someone something?
Of course, it was supposed to be operational ... I called, he took note, he said, to ask what it was in some rtv repair, because it worked for him. And "supposedly" will draw money, if it is something serious. He trades in radio radios, he has only positives. I currently have an old jvc cassette so I just swallowed the cables. It turned on, but this message immediately crashes, and nothing can be done to Help

Check for a short circuit in the speaker system. Plug in without speakers. You can still try to reset the protect stored in the processor's memory.

The problem is that the inscription appeared, without speakers connected, immediately after connecting the cube with power only. I read the reset post, but I can't turn on the error reset menu. I may not have these buttons, I was trying source + arrow
USB / iPad + Arrow
"Trybik" + zero reaction arrow

1. Unplug the radio.
2.Hold the keys marked in the picture.
3.Connect power to the radio all the time holding the marked keys, after about 2 seconds
the radio will go into error counter mode, ... let go of the keys.
5. Press the arrows to clear the errors so that the display shows DC OK.

Good luck

Thanks for the help. Reply to fast arrived in the evening, and I sent the radio from the morning, so as not to be afraid of problems, so I do not know if the problem was solved by the seller. Pozdraiwam