I have followed these instructions (
https://forum.xda-developers.com/pixel-3/how-to/guide-patching-boot-img-magisk-canary-t3964359) step by step... after step 8 however I could not get out of the fastboot. the device is not recognized anymore...
I hope someone can help me
i know my mistake now. i have downloaded an old firmware
Link for the Picture
Hi, this error appears due to the fact that in the guide for installing magisk there is an old link to the latest system image, and since you now have the latest version of the system, you are simply flashing an older kernel to a newer system, today you also encountered this problem, the decision is banal.
First, you need to download the latest image on the official website of the manufacturer (you have it installed at the moment), get the kernel from this image and flash it through the fastboot, then patch this kernel image in the magisk, and only after that flash the patched kernel. I will slightly simplify your task at the moment, but after the next update you will have to do all the steps yourself.
ust flash this image through the fastboot in boot slot.
patched boot.img
