[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] khounbean:
Hello everyone,

I can confirm that Jaguar V16 (2022-01-06) with official TWRP 3.5.2_9-0 and Magisk 23 still works!

( 1 ) If the Magisk app does not start on reboot, you need an internet connection, then disable "check updates" in Magisk settings.

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( 2 ) After upgrading, I noticed very rapid battery drain, and at first thought: it might be due to having OOS 10.3.11 as my base (instead of 10.3.8) before installing the custom rom (Jaguar V16); but I had also started using the latest TWRP 3.6.0_9-0 (2021-11-23, which adds base support for OOS 11 -- as Oneplus to my pleasant surprise, is still updating it (11.1.2.2 for December 2021!) -- so after switching back to TWRP 3.5.2_9-0 (2021-04-05), now the battery endurance seems to be back to normal!

Meaning the latest TWRP 3.6.0 is not optimized for batteries on OOS 10!

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( 3 )

Important for those re-installing Jaguar from scratch

: there were a few times where after I installed OOS 10 on both A/B partitions and then installed Jaguar, the internal storage was fine, but after installing the next month's update (which goes to the other partition), the internal storage became gibberish in TWRP (decryption problem) and unusable!

(a)

If this happens to you, I found a working solution

: when installing from scratch, each time you finished installing a clean OOS 10 and TWRP on a partition, you need to do a Factory Reset (without typing 'yes') -- which wipes all the phone settings and installed apps, but preserves your media files.

Meaning for example, after installing OOS and TWRP on partition A (plus formatted data) -- you need to reboot into partition B in TWRP, repeat installation of OOS and TWRP (and again, format data) -- THEN you can safely install Jaguar on either partitions!

(b) You can factory reset to both partitions within TWRP, followed by installing Jaguar on one partition, BEFORE booting into system -- so you might get an error message in TWRP about a missing /media folder (because the OS has not been setup yet, so you can ignore the error message).

Now you can boot into Jaguar and configure it how you like -- and the next time you "dirty flash" to the latest Jaguar ROM in TWRP (meaning: boot to recovery: install Jaguar and TWRP > reboot again to TWRP > install Magisk on the updated partition) -- you will NOT lose access to your personal data!

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(Important Reminders):

(a) Per Optimumpro's instructions, if you need to update the vendor (like from 10.3.8 to 10.3.11), you probably have to boot into system -- before installing Jaguar!

(b) But this will add another complication: before installing Jaguar, you will have to remember to FORMAT DATA (type 'yes' to wipe) in TWRP, which deletes all your internal storage files -- OR ELSE you will get that gibberish unusable /sdcard problem again!

(c) And if you do not copy the OOS or Jaguar ROM to the internal storage, and install it from there -- but try to install it from a USB (OTG), you may someetimes run into a device read error!

(d) Whenever flashing Jaguar in TWRP -- if you FORGET to also flash TWRP (zip) before rebooting, the other partition's data folder will again, become unusable gibberish!

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I hope this helps newcomers struggling with setting up their 6Ts with Jaguar!

And many thanks to Optimumpro for this great ROM!