[Redmi K20 Pro / Xiaomi Mi 9T Pro Themes, Apps, and] Espmic86:
found another (imho better) solution which actually solves also the netflix problem and apps incompatibility due to a mixed not tested and not optimized installation of xiaomi.eu rom with immensity kernel on previous solution, which actually works for 75hz refresh mod as explained above, but gives problems when you less expect.

Follow this one for all the others who want the best working solution with max compatibility (apps, L1 widevine HDR still works, netflix works, no apps force close etc) and also a little more fluidity (it's only 69hz but rock solid, the best solution for battery since it gives a little sprint from 60hz, can be visible to eye experts users and is not as forced as the 75hz one, considered that there is no way to force 80 and 90 hz really due to other problems that will occur) and also, which is actually important, no green tint on low brightness and also important no need to force enable the disable HW overlay option. This can be used as a perfect daily stable solution, for everyone.

1) install XIaomi.eu 11.0.5.0 (or any MIUI 11 Android 10 Q firmware, or based on CN vendor firmware). Of course you should already stay at this point or be able to do it, for references just follow related guides.

2) use stock kernel, major compatibility, no need to flash any other kernel, performances are great, whatever other kernel out there gives minor performances upgrade and major unsolved bugs/problems with minor software development and user help, really no need to install another kernel

3) flash 69hz miui 11 android Q dtbo, which actually should be based from global vendor but works on CN one (where the other CN based vendor dtbo mods didn't work... misteries of development and testing... whatever).

4) set anti DC flickering ON

5) no need to force disable hw overlays option on (so no need to install magisk module as well).

This way should have visible smoother and faster user experience, rock solid 69fps in test ufo, no frame drops and no geen tint, no settings to go out of head for, always working, always stable, and more important, netflix HD L1 HDR, which is actually the most important feature that xiaomi users where waiting for since poco F1 launch, so i don't think is something to lose just to have a 75hz mod which is actually unstable.

anything else is just no sense at the moment, if you want more, buy a rog phone 2 or one plus 7 pro, for 300 eur i got mi 9t pro global, taxed and shipped, 128 gb, 451.000 antutu points (more than 855+ samsung note 10+ and same score of k20pro premium with 855+, transfer rates and memories could be faster but hey, still a 300 eur model vs 1200 eur one) after all settings, faster display, HD everywhere, perfect blacks and calibrated colours, perfect pictures with the most stable and real world testing quality and comparisons google camera with an imported xlm with my settings after testing, a working dual stereo mod which actually required manual installation of mixer files and permissions resetting extracting those files from the only working mod out there which actually doesn't work with magisk anymore with latest firmwares after AML installation, with vanced black themed youtube with background playback and music and video with picture in picture always working solution, FINALLY always working google voice and assistent, and much more important perfectly working ANDROID AUTO and android go, no bugs at all, no drops in wifi speed, with some viper fx tweakings for mind blowing hd and accurate, crystal clear and deep bass sound on headset and WOW sound on both cell speakers... in all these sectors achieved way better results of a samsung note 10+, even in photo, even in sound... and i think we can't even discuss about mi 9t pro design perfection... think this is the best buy of my life in 20 years of electronics, IT, nerdcore stuff, pc's and all xiaomi phones tested... after these testings and tweaks and at this price, it's really a shame to look unexperienced ignorant users spending 1500 eur for something they don't even know how to use and don't even know how to compare and choose for, being entusiast of what they have bought... it's really a stupid, marginal, but real picture of how sick the world and people are today... people cries for money, look for the lowest price, but spend the double for something they don't even know what is.... and since this is absolut perfection and stability and optimization i don't find any reason at the moment for anyone to ruin their phones and stability with so many untested mods and not at all compatible kernels and third party apps etc.... comparing to the past, we were used to bad firmwares and optimization with excellent individual developers who made MAGIC with their mods, and now we have perfect not bugged faster solutions after some tweaking and we have too many individual developers who make their "Private experiments in public" spamming the internet with unworking solutions and too many different informations without any support or interest, making only damage and confusion to the "common user" who lands on those pages... i think people (developers) should do more private testing with their supporters before giving in public solutions which actually are not, just for their will to "partecipate to something", and when they public something should cover also users interests and needs.... we have only chaotic spam and not working things comparing to the past... to much threads too much pages too much comments which you can also read all but you end reading only of people who dunno what they are doing and other people who didnt accomplish their objective, only people requesting, no one caring of them, only developers publishing useless unworking unstable things, and then disappear and drop, yeah we know its just for sharing and nothing is due, no one is obligated, but then please just dont post anything, because here will land people that don't know anything even of basic experience, so developers and partecipants to the forum have the moral and civil due to give them practical and working solutions.