Should work too. I use the one from the AVS HD 709 files.
I use 2.2 and brightness 54 before the bug happened. After upgrading to 04.10.65 I had to ramp the brightness up to 61-62 to see the result like before, or switching to gamma 1.9. So I downgraded the firmware and I'm staying at 04.10.36.
Never tried gamma 2.4, when I got the TV it looked to dark for me and I used 2.2 because most calibrators etc stick to it too and years ago it was the standard for movies. But I'll give it a shot with the black clipping test
Here is a very nice discussion about this, including Vincent from HDTVTest:
As 2014 TVs begin coming out, I’ve been rethinking how I properly attempt to calibrate them. While measuring the grayscale and color gamut are easy, picking the correct gamma is hard to decide. There are many factors that come into play, from the room and environment to the capabilities of the...
referencehometheater.com