Probably the driver, not the chirp software. If you got a no-name programming cable like I did, make sure you aren't using the drivers that come with the cable. Windows also doesn't grab the correct driver by default, you will have to tell it which driver to use every time you plug in your cable.
There should be a YouTube tutorial out there explaining how to set up the correct/older driver.
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*Busy signing for his packages*
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