Ok this is a file that seems to work, I am posting it
Here
Steps taken as per instructions used on Telegram in the Kang11 rom chat
Rohit Padmin
a user
Oct 16, 2020 12:52:22 PM
Came from OOS 10 with Dualboot TWRP
1.Flash Kang11 in inactive slot,,format data inactive slot better
2.Flash original TWRP 3.4.0.0
3.Flash Magisk 21.zip
4.Reboot to Recovery
5.Flash DualbootA11 ( i used OTG storage ) it will stuck when patching inactive slot,,nevermind,just hard reboot ( power+Volume up)
6.Enter Recovery ( power + volume down )
7.Flash Magisk A11.zip ( i use otg storage )
8.Wipe cache and reboot
9.Play with Kang11 while,,
10.Reboot to recovery
11.Change to inactive slot,,Reboot recovery
12.Flash Dualboot TWRP for android 11,,it will stuck when patching inactive slot,nevermind just hard reboot ( power +volume up)
14.hit power button,,enjoy