FP4 Root Access is possible, maybe a bit risky

[hirnsushi]

@Strugus

Today I wanted to look at iode, so I downloaded the patched one provided by hirnsushi.
Connected my phone to my pc, adb reboot bootloader and fastboot boot boot.img.

You mean you downloaded the iode boot.img and booted from it?
Those are only boot images not system images, they only contain the kernel, ramdisk and some other stuff.
You can’t turn your /e/ install into an iode one using a iode boot image. All you did, if I understand you correctly, is booting into your /e/ install using a iode kernel and ramdisk.

@Strugus

Since then I only get the /e/os logo in a bootloop and any image I fastboot boot either just restarts or also show the /e/os logo in a loop.

Maybe the system switched to the other slot because something went wrong during the next boot, please try:

@hirnsushi

Have you tried changing the slot?

$ fastboot getvar current-slot
current-slot: a
$ fastboot --set-active=b

If you are in slot b already, switch to a.