Thanks Bro.
Should i do follow below steps to flash Twrp 1206.
1) Enter existing twrp by holding power + volume.
2) Select install, choose Twrp 1206 img file and swipe to flash.
3) Reboot to system.
After flashing Twrp 1206 should i do following steps.
1) Download Rom 20.12.29 to phone...