No issue for me at all. Go change your fake headphones since it is giving you problem. Show some respect here
Follow instructions from latest build. For your case, stock rom, twrp,.. see instructions. It's fairly easy. Good Luck!
Dev dirty flash guide is listed very clearly and that is the steps you should take. How clear u want it to be?well, I am on sep 19th and I've tried from updater but it fc when I click install.
I've tried from twrp : wipe dalvik and then install zip and reboot system and ended back in twrp.
Then I rebooted on slot A and was still on sep 19th build.
I'll be happy to have more specific information on dirty flash process to, because on my mi9 I only had to wipe cache, dalvik and install the rom zip to do so.
*** Disclaimer I am not responsible for any damage you made to your device You have been warned