Waiting for any device is generally a very reliable indicator. The phone in Fastboot mode is not on the end of the USB cable.
Could you tell with certainty that the phone was still in Fastboot mode?
You can deliver fastboot commands but perhaps not reliably.
Perhaps look at the whole USB chain. It has been reported that certain USB will not carry fastboot commands or complex fastboot commands. You will need a good quality (full capacity) data cable, so not a thin, skinny cable. Avoid a USB-C to USB-C cable as it may be provisioned through a hidden hub. Avoid USB hubs including any USB hub that might be hidden in the PC / laptop; for predictably good results check (if necessary with a manual) that you are connecting to a USB-2 port soldered to the motherboard.
Ofc rule out any possibility of a loose or dirty USB port on phone, cable or PC.
sudo fastboot flash recovery recovery-e-3.6-a15-20260314594290-community-instantnoodlep.img
Sending 'recovery' (102400 KB) OKAY [ 3.516s]
Writing 'recovery' OKAY [ 0.378s]
Finished. Total time: 4.070s
Shut down the phone => Volume down + Power => doens't show the Main recovery screen but the bootloader so I can not install from e/OS recovery
This is a well known issue which varies by manufacturer.
This first boot into recovery is the time you break original Android.
When you have flashed recovery you must avoid getting the phone to do a standard shutdown and restart Recovery cycle. This will fail and overwrite the new recovery. The e-recovery will have to be flashed again after any such fail.
I think I’m stuck now. Android OS wont start any more so I don’t know how to connect the phone to the computer. The adb devices list and fastoboot devices list aren’t showing any connected devices. I can only access the phone’s bootloader.
I did menage to connect the phone after all. I have also repeated the whole procedure from flashing additional partion on and have succesfuly installed eOS.
THANK YOU BOTH for helping me and staying with me untill the end!
I have double checked. All the files are e-3.6-a15.
But now that you asked - I’m not sure any more was the original OS Oxygen 13 on Android 13 or the underlying android was 12. As far as I remember they are not always the same
I did the update of the phone right before the flashing though.
To be honest I don’t understand the data in your post. It’s way to technical for an elderly guy
Is there a way to restore the eOS on my phone or do you think not? Oneplus 8 pro is not my primary phone. I’m using a Fairphone 6 with eOS so it’s not s big disaster. I would like to use this one too if possible
I menaged to flash the original Oxygen 13 on Android 13 so I’m now back to square one.
I tried with windows 11 this time but ran into problems again. The phone is now unlocked. I tried the procedure on page /e/OS Installer . I got to the step where ROM was successfuly downloaded to the phone. After the restar to a bootloader the phone can not be connected to go on with procedure. The error is:
Error on step: connect-bootloader
Cannot execute command connect bootloader
The device is not connected Failed to connect: Cannot connect to bootloader after 3 attempts. The device may not be in bootloader mode yet. Please ensure the device is in bootloader/fastboot mode and try again. Error: Failed to request USB device: Failed to execute ‘requestDevice’ on ‘USB’: Must be handling a user gesture to show a permission request.
Proposal: Check connection and that no other program is using the phone and retry.
With the screen beeing unlocked software downloaded but after the restart of the phone in bootloader mode after trying to connect the phone to a computer a new connection error has appeared.
