@Nifalti So you can boot into e-recovery now; that’s good, you’re nearly there!
I’m guessing the next step you want to do is install the e operating system zip file , yes?
Carefully follow these next steps:
On the computer open the terminal in the folder with your platform tools, /e/ os zip etc
With the phone disconnected turn it on in the e-recovery mode.
Plug phone to pc and check you can connect in adb by typing in terminal
If all is good this should return the serial number and the word ‘device’ and you can move on to the next step below.
If nothing happens or the output says ‘unauthorized’ then this would need troubleshooting before proceeding.
I assume you need to use volume keys to navigate in recovery on this device.
On Phone navigate to ‘Factory Reset’ and press power button to confirm.
This will take you to another screen to confirm you want to ‘Factory reset and Format Data’ etc. Do that also and the device is now wiped.
Navigate to ‘Apply update’ and select. Select also ‘Apply from ADB’.
The recovery screen should now show a small message at the bottom: ‘Now send the package you want to apply…’ etc.
On the computer type the command:
adb sideload <e-0.15-q-2021...whatever.zip>
Terminal output should show that the zip is being served to the phone. Normally it goes to ~47% and then it may feel like nothing is happening, but just wait.
There will be some output on the bottom of the phone recovery screen: ‘step1’ followed by ‘step 2’. Again it might feel like nothing is happening, but just wait… When the zip file is completely loaded the recovery screen changes and you will see that you have an option to ‘Reboot system now’
At this point you can unplug phone and select ‘Reboot system now’