Turn off the device. Press and hold the SEL button, then press the power button. The boot screen will show HW: x.x and FW: x.x.xx .
Locate the official firmware repositories. Zeeweii distributes updates through their official customer support portals, official AliExpress store links, or community forums like EEVblog.
Improved calculations for voltage when using probe attenuation.
If the screen is frozen, or the device fails to boot after an update:
Updating typically requires a PC, a USB cable, and specific WM Upgrade Tools.