derpfest 12 is Android 12, you need clean install, backup your data, install firmware, Rom, format data and reboot to system.
Can you give me link of firmware required for derpfest 12?? Is derpfest 12 for daily driver? Means for net banking apps??? Any bugs??
I use Pixel Experience - Unofficial | Android 12.
Where have you downloaded Pixel Experience with Android 12? I thought it wasn't available yet for Mi 9TI use Pixel Experience - Unofficial | Android 12.
I can not tell you anything about the Derpfest 12, but surely has a group in Telegram where you can ask.
I leave you here the link to the firmware that you must use.
This is the link for the derpfest group in Telegram: www.tg-me.com/adidavinci1
/* * Your warranty is now void. * * I am not responsible for bricked devices, dead SD cards, * thermonuclear war, or you getting fired because the alarm app failed. Please * do some research if you have any concerns about features included in this ROM * before flashing it! YOU are choosing to make these modifications, and if * you point the finger at me for messing up your device, I will laugh at you. */