Just my thoughts on the Gen4 colour space...
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How to Downgrade your Firmware https://forum.blackmagicdesign.com/viewtopic.php?f=2&t=7867
TLDR: Reset your BMPCC camera settings, download the software you want, then update the camera how you usually would. Do this at your own risk, I'm not sure if there are any issues with doing this... I don't know why there would be. Since you're still here reading this... Subscribe... And have a great day!