CHIRP

Try Baofeng BF-888 from the list.
If that does not work, can you provide some internet link to a picture, site with details about this radio, and/or FCC ID.
I cannot find anything on a simple search for "Baohui BH-620" or similar.

Thanks for your interest, Jens.

I've tried BF-888 because it seamed the most similiar but it doesnt work.
I'm a little experienced, I have Baofeng uv82 and I can connect and operate it by usb with any trouble.
I'm afraid they doesn't have FCC ID, the company doesn't have www either.
But ther's a photo and details:

http://allegro.pl/krotkofalowki-zestaw-2-szt-zasieg-10-km-hit-i3946189470.html

Serial number: S/N: TX2510121025620570, BATTERY: S/N:TX2510121025620129
The price is good but service...
If u're so kind, look at this.
Sincerely
Dobroslaw

When you say BF-888 doesnt work, what do you mean?
Can you attach a debug.log from a session where you attempt to download?

Can you provide the programming software or a link to it?
Without the programming software, one could only get lucky if it was an exact clone of another common model (which it probably is, but I'm not an expert on this class of radio).

I use CHIRP, and with BF-888 there's:
Radio returned unknown identification string.
e.g. for F-11 it's:
Radio did not respond.

I have the same brand but it's called Baohui BH-918 and can be programmed by the keypad. Will check if i can program it by chirp.