I bought a mouse with backlight, I want to put only 1 color instead of 7, explain where to climb and what to rewrite. There is no driver from the manufacturer.
You do not need a driver, but you need to rewrite the mouse firmware. To begin with, open and find out the model of the microcontroller, whether it is possible to read the firmware. Then disassemble and find the color switching. Correctly modify and write back