Drivers & Utilities
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WiringPi 2.52 - WiringPi
Gordon doesn't mention it on his blog, but it's probably best to remove the pre-installed WiringPi software package before installing version 2.52. As mentioned in his blog though, version 2.52 is required for Raspberry Pi 4B:
** Note: MD5 checksum provided is for version 2.52.