Google Pixel 4a - Install

This is not the nicest presentation ever, but he includes a video to help make his point - but it looks like he is describing a situation very close to yours. Found with other similar explanations by searching this.

This adb server's $ADB_VENDOR_KEYS is not set

https://krispitech.com/adb-vendor-keys-not-set/

Edit, if I follow this correctly (I am not sure) but is your PC now seeing the same device with a different identity? Would this be why you must now delete some history?

Yes!
So easy :wink: Just unplug and plug in the USB without rebooting anything.
The device is detected again.

All that remains is to try…

Thanks everyone.

Pierre

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I do a “fastboot flashing lock”.
The phone boot with “Can’t find valid operating system.”
The device will not start.

If I press Power + Volume Down, I can select :

Restart Bootloader
Start
Power off
BaCode
Rescue mode
Recovery mode

PLEASE HELP

I am reading this thread. Good that you got some progress.

I’m ready. T.Y.

I unlock the bootloader and the device boot again.

Why can’t I lock the bootloader again ?

Great!

Why can’t I lock the bootloader again ?

Because it is not in the instructions would be good enough for me! :blush:

Speculation Google never wanted you to liberate their hardware!

Only a few Android phones allow to relock bootloader safely in my experience.

It is not written ok, but the opposite either…
I’m not sure but I think that calyxos do it.

What’s the risk about an unlock bootloader?
Can an application modify it?

Google never wanted you to liberate their hardware!

Vote E.U. law !!! :rage:

I see the lock more like this. The system is proprietary; it had a verified boot; it had a lock to seal the system.

Google make claims that everyone can trust the sealed and verified system.

You have liberated it.

It is a different ball park.

Can an application modify it?

I have never thought a 9mm thick highly networked mini computer was secure.

Edit. I am in danger of starting something here on locking! If you copy the Google method and have a “signed system” you can lock the bootloader as done for example by Divestos!

The risk is always an estimate that differs according to the system but especially the person who estimates it.
To try to have a precise estimate, it is necessary to try to know as precisely as possible the studied system.

There’s no safe system, but you can try. ( a Debian daily user :wink: )

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