Moxa’s serial port devices, such as serial port servers, serial port cards, and USB-to-serial devices, require driver installation to function properly. Sometimes, after installing the driver, issues may arise where the device cannot be used normally. In Device Manager, the device driver shows a yellow exclamation mark, indicating that Windows cannot verify the digital signature of the driver required for this device… (Code 52). The error is shown in the image below:
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Solution:
Install patches KB3033929 or KB4474419
Note: This patch is not provided by Moxa; please obtain it from official Windows sources or legitimate channels.
Author: Ganggui
Editor: Jenny
