Do not upgrade your firmware if your box was not activated before 2024.8.31;
Normal upgrading is supported if your box was activated before 2024.8.31.

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Preparation

  1. Setup your Kmbox B+ as image below:
if you are gaming on a single PC, cables plugged to Port Serial and Controlled PC should both be connected to the Gaming PC.

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Install Serial Driver

For first-time users, please check the Device Manager -> COM Port to see if there is a USB-SERIAL CH340 device.If it is displayed correctly, you do not need to install this driver and can skip this step; if it is not displayed, please install this driver.

Kmbox B+ Serial Driver

COM Port driver, download, extract and install it on Second PC
The COM number is randomly allocated for each PC, check yours to make sure.