6.8 firmware on P4k hdmi monitor issues.

I seem to have connectivity issues with 6.8 to my external monitor, it would show "no signal" or show strange pink or green tinted images.
Downgraded to 6.6 and its fine.

Monitor is feelworld MA5 and also 40 inch samsung.

Update:
Rolling back to 6.6, issue gone.
Updated to 6.8: issue returned.
Rolled back again to 6.6: issue gone.
Updated again to 6.8: issue fixed.

Sounds more like the issue wasn't in the firmware. Maybe the cable?

I had neither before nor after the update a problem with the HDMI signal from my PCC4K.
Tested with: Atomos Sumo, Atomos Shogun Inferno, Atomos Shinobi and a Samsung TV.

HDMI working fine from the BMPCC4K 6.8 to the BMVA12G7 3.02.