Unable to delete Apple WWDRC Certificate

Question

Recently Apple posted an announcement, according to this the intermediate certificate got expired on Feb 14th and has to be downloaded manually and should replace the older expi

Answer 1

https://discussions.apple.com/thread/7357200?start=0&tstart=0

As you can see in the above link, some keys cannot be deleted while the OS is running in full mode, and you need to boot in recovery mode.