It’s okay. U already spent so much time fixing my dumb mistake.
Thank you a lot for this!
Just to finish this story, I performed a factory reset through the recovery and despite loosing the data, it now works flawlessly again.
Next time I’ll first finish my setup, perform a backup and only after these steps I’ll try fiddling around with other os’es I know nothing about
@hirnsushi Would you like to elaborate a bit on this?
In particular, I installed iodé and rooted the phone (with a patched boot image and Magisk) and I wonder if it’s possible (and advisable?) to relock the bootloader (I know about checking get_unlock_ability) and have Verified Boot enabled (after flashing iodé’s avb_custom_key). Or will I need to unlock the bootloader again for e.g. system updates?
You can’t lock the bootloader if you rooted your phone.
I am by no means an expert in AvB, that’s why I’ve called it a minefield, but since rooting your phone does alter your boot partition the hashes wouldn’t match anymore and hashes that changed are no longer verified
You have two choices:
If you switch to stock (unrooted) and relock the bootloader you don’t have to unlock the bootloader to perform OTA updates, but you also won’t be able to use root.
If you want to stay rooted you’ll have to disable Magisk every time there’s an OTA update:
I’m new here and do not own a Fairphone 4 yet. But I like the concept and I think it has everything I need from a smart phone.
Since I want to OWN the phone I want to root it. The rooting process as described here needs Windows or MacOS at some point – I only have Linux available.
Is a howto available with respect to that?
How is OS update OTA possible?
For now I don’t want to replace stock OS with . Did it when using an old Samsung S3 → CyanogenMod. But with the new FairPhone I would try it with stock OS first. Just Magisk is mandatory. When later changing to another OS I have Titanium Backup to save my data.
Your tutorial: I am stuck at point 1. How do I patch the downloaded stock boot.img with Magisk?
Where can I get the boot.img? [EDIT: Sorry, overlooked the link in FP4 Root Access is possible, maybe a bit risky - #43 by hirnsushi]
I know how to handle Linux but I am quite unexperienced in flashing phones.
Any problems to get the Fairphone recognized by my Linux PC?
You have to install the Magisk app to your FP4, select Install → Select and Patch a File and choose the boot.img.
Don’t use the old boot.img that’s linked there, you can get newer ones here.
Depends on your distribution, but generally not a problem. You’ll need the Android platform tools for adb and fastboot, but those should be packaged already. If they don’t work without sudo you might need android-udev-rules as well.
Some USB-cables / -ports can sometimes be a problem with fastboot but that’s not Linux specific and can only really be solved by trial and error, other than that you should be fine
Just to be sure: This does work with the official rom from fairphone?
currently I restore the image, install the update, do one reboot, boot from an older image and patch the current image, and reboot. patching directly after install and before reboot would save quite some time.
I used the boot.img in the CalyxOS installation file (FP4-factory-22307020.zip). That zip includes a image-FP4-sq3a.220705.003.a1.zip, which contains the stock boot.img. I patched that one, booted from it and was able to direct install via Magisk app. Thanks!