[OnePlus 8T Questions & Answers] shadww:
Update worked, however I need to highlight that 11.0.6.7 seems buggy to me (Stutter and other stuff)

Ok. So I got Global 11.0.6.7 update (OTA, incremental, around 500 MB size).

I updated and it worked (with all cyberpunk elements working and nothing changed).

Proof:

1) Cyberpunk8T Phone at Global OOS 11.0.5.6, and showing receiving new update under system-update:

2) Downloading Global OOS 11.0.6.7 update. Not full update, OTA, incremental, around 500 MB size:

3) Booting to Global OOS 11.0.6.7 after update and restart (it took a bit more time while booting, but worked at the end):

4) Showing updated phone to Global OOS 11.0.6.7 with cyberpunk elements intact:

So, I think flashing cyberpunk cust on both slots before, and then relocking and updating did work.

Below I will put the steps I took (please note that I tried this on Global version, no idea if EU or IN is the same).

Steps:

-1) If you received phone on HOS, do full local update into next HOS in order to ensure cust is flashed to the other slot. (preferably do 2 HOS full local updates just to ensure, recommended versions are OnePlus8T_Hydrogen_11.0.4.5_15.H.19_KB05, and OnePlus8T_Hydrogen_11.0.5.6_15.H.20_KB05. (another option would be to flash cust at this stage, but I am just stating what I did personally).

0) Use MSM tool to convert to Global OOS (check thread and forums for this step)

1) Now your cyberpunk 8T phone should be on OOS, and you have all cyberpunk elements working (this is important as it points that param flag for cyberpunk is active)

2) Unlock bootloader and root the phone (credit to @Kihara777 )

(for full info about this step check https://xdaforums.com/t/module-cyberpunk-2077-resources-for-oneplus-8t-devices.4198459/post-84055453 )

(for root info read https://xdaforums.com/t/guide-how-to-root-oneplus8t-cn-in-eu-us-kb2000-kb2001-kb2003-kb2005.4178675/ )

2a) download this image: https://1drv.ms/u/s!AsJy8Rcn_wjLhLwuunq7W9seKfKT7Q?e=vTKQd0

2b) Use below commands in adb to push the cust images (google how to to adb commands).

adb push H19_OTA-oem_cust1-raw.img /sdcard/oc1.img
(I actually unziped and copied the file to phone root through windows and renamed it to oc1.img, then did adb shell in cmd, and ran the below commands)
su
dd if=/sdcard/oc1.img of=/dev/block/bootdevice/by-name/oem_cust1_a
dd if=/sdcard/oc1.img of=/dev/block/bootdevice/by-name/oem_cust1_b

2c) remove root and relock the bootloader (optional)

[Alternative to step 2 if you cannot root][Tested by @lexcyn Thanks! ]

2) Unlock bootloader

2i) download this file: https://1drv.ms/u/s!AsJy8Rcn_wjLhLwtuwnEWCG4E1bNMQ?e=iRf5jm

2ii) flash through fastboot using these commands

fastboot flash oem_cust1_a H19_OTA-oem_cust1-sparse.img
fastboot flash oem_cust1_b H19_OTA-oem_cust1-sparse.img

2iii) relock the bootloader (optional)

3) After rebooting the phone, you should have all elements, and OTA incremental updates should not affect your cyberpunk elements or cause bootloop

This what have worked for me. Please familiarize yourself on how to unbrick just in case things did not go well.

Edit: fixed OOS 11.0.6.7 video link, and info about the adb commands

Edit2: flashing cust files using "dd" commands require the phone to be rooted. Alternatively, I added another flash commands using fastboot that not require root.