[/e/OS installer on Fairphone 6] "Allow USB debugging?" popup doesn't appear

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I am trying to install /e/OS on an Android Fairphone 6. I have successfully activated the developer options, unlocked the OEM function, enabled USB debugging and enabled File Transfer (in the Default USB configuration menu).

The next step (“We’ll now connect your phone to the browser. When this pop-up appears, select your telephone from the list.”) goes fine - the popup appears, I select my phone and I click connect.

The next step says “A pop-up window will then appeared on your phone. You will have to check always allow from this computer before pressing ok.”, but this popup window (the one that the image says should be headed “Allow USB debugging?” never appeared on my phone. The installer remained on this same screen, and if I try to click Connect again, the popup on the computer says “paired” next to my phone, and the following error message appears:

Error on step: device-detection

Cannot execute command connect adb
The device is not connected Failed to connect: Cannot connect ADB Cannot read properties of undefined (reading ‘deserial’)
Proposal: Check connection and that no other program is using the phone and retry.

The installer does not advance.

What can I do now?

try unplug then replug the USB cable

I’ve tried that, it doesn’t help. Whatever I do, every time I click Connect in the “Device detection” step of the installer it fails and gives me the error message from above.

From the error message, the only thing I can think is that something else on the computer is somehow using the phone, but I don’t know what it could be or how to check.

The web installer is not in coherence with the install method for this device, why it fails.
better switch to the new “install-script” method

for the FP6 install, adb is only used to reboot the device in bootloader mode,
you can do that using the buttons…

BUT the error can also signify that your cable is not data capable.

also, if you use windows, check [Solved] Windows does not see my phone in Fastboot mode

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Forget the /e/OS installer. Rather try manuell installation, success rate is higher I would say.

Get the drivers sorted in Windows thru device-manager, Linux → no need for drivers.

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Forget the /e/OS installer. Rather try manuell installation, success rate is higher I would say.

Do you know where I can find instructions on how to do that on Fairphone 6? I tried googling but all the results I found were for earlier Fairphones.

i hope it can help in the future.

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It’s a new data cable. It is from Amazon so it could have been mis-sold I suppose.

I don’t even know how to boot a phone into fastboot mode, or what that means. It’s possible I am already in over my head.

on the Info about Fairphone The Fairphone (Gen. 6) - FP6 (https://doc.e.foundation/devices/FP6) we can see :

Boot Modes

Recovery

With the device powered off - hold Volume Down + Power, then select “Recovery mode” using Volume keys.

Download

With the device powered off - hold Volume Down + Power

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