Thank you very much for your support. I think I wasn’t clear at the beginning. I apologise for this. I will now explain step by step what I have done. This is for the following reason. I have now installed LineageOS instead of e os and these instructions etc. have worked. I strongly suspect that I made a mistake in following the e os instructions. Maybe you can point me to the mistake if I describe in more detail what I did.
I have tried to follow these instructions: https://doc.e.foundation/devices/devon/install
Since the instructions say that fastboot must not be older than version 31.0.2. and the version of Linux Mint is significantly older, I first installed fastboot etc. according to these instructions https://wiki.lineageos.org/adb_fastboot_guide.
Then I switched on USB debugging on the phone
Then I downloaded the zip and img from here https://images.ecloud.global/dev/devon/.
Unlocking the bootloader
Next I switched to the bootloader with adb reboot bootloader. With fastboot devices I could see the device in the console. With the help of fastboot oem get_unlock_data and the Motorola support page the bootloader could be unlocked.
Flashing additional partitions
Now you should unpack the zip file you downloaded before, in my case the e-1.20-t-20240222382228-dev-devon.zip. It should contain two files: dtbo.img and vendor_boot.img, but they are not included. In this case you should get these files from LineageOS. So I downloaded them from here: https://download.lineageos.org/devices/devon/builds
Now I have put my phone into bootloader mode and then flash the two files with this command:
fastboot flash dtbo dtbo.img
fastboot flash vendor_boot vendor_boot.img
Temporarily Booting a custom recovery using
Start the phone in bootloader mode. Then I transferred the image with fastboot flash boot recovery-e-1.20-t-20240222382228-dev-devon.img
Steps to install /e/OS from recovery
I formatted the device in e os recovery mode.
Factory rest → Format data/factory reset → Format data
In the main menu of e os Recovery I then selected Advanced → Enable ADB to make sure that adb is active.
In the main menu of e os Recovery I then selected Apply update → Apply from ADB.
On the PC I then used the command adb sideload e-1.20-t-20240222382228-dev-devon.zip
And now I get the error message
adb: sideload connection failed: no devices/emulators found
adb: trying pre-KitKat sideload method...
adb: pre-KitKat sideload connection failed: no devices/emulators found
Regarding adb problems, I have read that you should run adb kill-server and adb start-server and then it should work again. Unfortunately, this did not help me.
As I said, I’m a newbie. I therefore assume that I have probably done something wrong. I just can’t find my mistake. I find it interesting that I was able to follow the LineageOS instructions and everything worked. So I believe that my hardware USB cables etc. are working. Does anyone have any tips?
A stupid question. Can I also use the recovery from LineageOS and then install the OS from e os over it. Is that possible?
Thank you very much for your help