New Rigol dho804 oscillocope

I use  the power adaptor provided in the accessories box and I connect it to the AC power source (220 V, 50 Hz ).

It’s USB-C

OK, than you need an USB-C power supply.
In this case, I do not understand the photo, which Jan Cumps posted couple of hours ago - https://www.eevblog.com/forum/testgear/rigols-new-dho800-oscilloscope-unbox-teardown/msg4965181/#msg4965181

where at the adapter is clearly indicated as a the circular bayonet connector with + inside and - outside.

But, I am almost sure, that the power source is not a problem. If the scope is able to display a Rigol logo for five minutes and do a restart after that a go to loop, it really looks like a firmware problem.

PavelKCZ  Can I do something to reset firmware before start up operation? To make sure it's not a charger problem.

Yeh, that’s confusing: the referenced PSU has a circular connector according to the datasheet, but the text with that message implies it has USB-C and same poster’s picture of the back of his scope shows a USB-C socket.

I would not recommend any reset or any similar operation.
If the instrument is under the warranty, the only proper way is to contact the vendor and ask for exchange for working instrument or money back.

PavelKCZ You are right , the cost of purchase, shipping and taxes was exorbitant, about $500.

I ask for why this pin is exist although that the USb type C is the same for two directions

Definitely.
You can try to repair an used instrument which you bought on E-Bay for example.
I did this myself, last time it was an Agilent 53132A frequency counter which I bought from China. The instrument comes, but after power up, the panel was dead. I opened it and I found that the flat cable between panel and main board was unconnected. I reconnect the cable and the instrument started without any problem. But it was a used instrument, without the warranty.
In your case, you have a new instrument under warranty, so go and require the exchange or money back. 500 USD is not a small sum. 

dougw Jan Cumps  Andrew J PavelKCZ anniel747 

 I thank you all for taking the time to give me valuable advice and if I find a solution I will share it with you.

dougw Jan Cumps  Andrew J PavelKCZ anniel747 

 I thank you all for taking the time to give me valuable advice and if I find a solution I will share it with you.

The Rigol service just sent me the mail and said that "please try the following solutions:

• Press the power button and quickly press the BACK button on the front panel multiple times. This may reset any incorrect settings.
• Alternatively, place the latest firmware on a FAT32 USB drive, power on the device, and follow the on-screen prompts to upgrade the firmware.
• If these steps do not resolve the issue, please contact our support for further assistance by 'reply all' via this email.' But I don't know what is he meant by back button