QYT KT-8R Frequency expansion
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Google translate english from a russian radio forum. 

OCOTRAN KT-8R, a.k.a. QYT KT-8R - RDA build.

The QYT KT-8R station is made on the VK4815N chip, which operates in the 124-560 MHz band. 

Press the MENU key and turn on the station. Enter the password 1001200. Then the station passes 
through the bands. It is necessary to enter the initial frequency, the final frequency, the output 
to the transmission (1) or not (0) in a row.

For example, "1441461" means from 144 to 146 MHz and the possibility of transmission.
At the end of the input, a single (error) or double (confirmation) beep sounds.