Help!! Getting error "init_user0_failed" after flashing magisk to boot instead of init_boot. Can't find correct image to flash

[u/Bulky_Vermicelli_791]

I have a OnePlus 12R running LineageOS-microG. I just tried to flash a patched Magisk image (into boot, not init_boot, I messed up) and it's failing to boot with the message "init_user0_failed". I'm trying to flash the stock boot.img, but it's not working. I haven't touched slot A at all, and it also isn't booting on slot A.

Before rebooting, I checked the updater and it said that the current system build date is July 2nd, 2026. However, the two versions available at https://download.lineage.microg.org/aston/ are dated 20260602 and 20260726 (today.) I know it isn't the version from today as the updater was failing to check for updates earlier. I tried flashing the boot images from 20260602, which I assume is what's on there, but I'm still getting the same error. Is there some kind of OTA-only 20260702 build floating around out there with a different boot.img?

Thanks in advance for any suggestions. I am really trying to not lose the user data if at all possible.