How to revert to OEM Firmware after trying out iode

How does one revert to OEM OS for the OnePlus 11 after trying out iode?

Mere flashing of OOS with fastboot will get your device bricked. Even flashing with EDL fails if you flash an Android version lower than Android 15 (which is the current Android version of iode 6.1).

I was on OOS Android 13 before I attempted iode 6.1. The initial attempt failed, and the device got bricked. Rescued and tried again, succeeded. But now I want to revert to stock OOS, and I got hard bricked again.

This is such a mess I can’t wait to get out of.

I don’t have any experience with OnePlus but checking if you made sure to wipe userdata after flashing back to an A13 base from the A15 base of iodé? Alternatively does OnePlus have a A15 base image available?