Jetson TX2 cannot flash v4.2 image using 4.6.4 SDK after flashing 4.6.4 image

What should I do if I have software pinned to 4.2 but new hardware requires a newer Jetpack because of the DRAM PCN changes with newer TX2 hardware.

I saw this link: https://forums.developer.nvidia.com/t/d02-module-would-be-affected-by-pcn-206440-tx2/233117/11

But I have not yet followed it because I’m not sure if they ever got it to work.