How to update rom?


Dec 4, 2018
Hello everyone, new in custom ROMs. I just flashed 8.11.23 to my RN6PRO and it looks laggy a bit. Wanted to try 8.11.29 but I messed up with TWRP. Had a bootloop and I'm back again I'm 8.11.23.
Is there any way to update to 8.11.29 and every new update without TWRP(unofficial)? Because I don't want to have a SD card in. I use a double SIM all day for my work. Thanks in advance and happy to be a user of