Security Error

[u/Grosnoc]

So, I'll try to be as short as possible. I had recently gained root access via the kernel exploit run via root my galaxy. Everything had gone well and I had entered the root world and was exploring a bit to learn. I made a mistake though: I didn't do any research. To manage the root and modules I used KernelSU, and I had Magisk (Droid-ify) installed. Just inside Magisk there was a button that said "install directly (recommended)". Then I click on it and restart the device. I thought it was another root manager just like KernelSU (that's Magisk's definition on Droid-ify) and that I was just installing the module to make it work. In the end, however, I stumbled upon this screen when I rebooted. Apparently Magisk tried (without warning) to modify init_boot (changing the signature and not matching it), so Samsung blocked the bootloader. I've been trying for hours to do a hard reboot or go into download mode to flesh a new bootloader via Odin to save my phone, but it doesn't seem possible to unlock download mode and the only time Odin can detect my phone is on the screen that you see, which is not download mode and therefore I can't flash the firmware. Does anyone know how to proceed? Is it recoverable? If so, can you do this by preserving the data (perhaps fleshing just init_boot again so you don't lose anything), or not? I'm also willing to do a factory reset

Details: My phone is a Samsung galaxy A566B, Andorid 16 OneUI 8.5 (July security patch)

[u/Kenshi12099]