Hello everyone,

I have a modified version of the TYT TH-UV99 that supports additional frequency 
ranges — for example, 300–360 MHz.

When I try to use CHIRP, I can successfully download channels in the 300–350 
MHz range from the radio. However, I’m unable to edit them due to the following 
error:
“Invalid edit: Frequency 300.050000 is out of supported range.”

I checked the driver (chirp.drivers.th_uv88), and it appears that the supported 
ranges are hardcoded in the VALID_BANDS variable to:
[(136000000, 174000000), (400000000, 480000000)]
See this line for reference:
https://chirpmyradio.com/projects/chirp/repository/github/revisions/master/entry/chirp/drivers/th_uv88.py#L538

I’m thinking about modifying this line to include the range my radio supports:
VALID_BANDS = [(136000000, 174000000), (300000000, 360000000), (400000000, 
480000000)]
Would that allow me to edit and upload those channels back to the radio?
And if so, where exactly should I make this change — do I need to recompile 
CHIRP, or is there a simpler way?

Thanks in advance for your help!
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