Download the "M88" generic software, run as admin, set 800 DPI @ 1000Hz, save to mouse, and delete the software.
However, like many generic gaming mice, the doesn’t always work "plug-and-play" regarding RGB control and macro buttons. You need the specific software to unlock its full potential. Zk-m88 Gaming Mouse Software
Have a different version of the Zk-m88? Drop the chip number (found under the magnetic cover) in the comments below. Download the "M88" generic software, run as admin,