AndyBloom64,
Welcome to the forum.
Did you read the ToH of the MX4200?
https://openwrt.org/toh/linksys/mx4200_v1_and_v2#potential_limitations_and_issue
There is written (2): * NSS acceleration: the Qualcom NSS hardware acceleration is not available and maybe never will be. There is a community effort to enable it in the forum but this does not guarantee that it will be officially supported in the future.
Most probably the OEM is using this NSS acceleration?
DGDodo.