Hello everyone,

I have purchased several brand-new Pixel 8a devices and I am trying to install GrapheneOS on them for myself and friends, but I am encountering serious problems when connecting the phones to computers. I will try to describe the situation and the steps I have already attempted as accurately as possible.

Problem:

The phone is not recognized in fastboot mode – fastboot devices shows nothing.
ADB occasionally recognizes the device in regular Android mode, but as soon as I enter fastboot, it disappears.
lsusb in regular Android mode shows "Google Inc. Nexus/Pixel Device (MTP + debug)", but in fastboot mode, there is no USB device.
When I use the GrapheneOS Web Installer, the phone, with much effort and not every time, is occasionally seen as “Pixel 8a - Paired”, but after I click Connect, I receive an error:
Error: Failed to execute 'claimInterface' on 'USBDevice': Unable to claim interface

This issue occurs on two different brand-new Pixel 8a devices, which rules out the possibility of a hardware defect on one phone.
What I have already tried:

Different cables and ports – including the original cable from the box, various USB ports on both a laptop and a desktop computer.
Two operating systems – tested on both Windows and Ubuntu, with the same results.
Driver installation and update (Windows) – manually downloaded and installed the Google USB driver.
Udev rules (Linux) – added rules for Pixel devices, executed udevadm control --reload-rules.
ADB and fastboot reinstallation - installed the latest android-tools-adb and android-tools-fastboot packages.
ADB debugging and USB configuration – enabled USB debugging and File Transfer mode in Developer Options.
Restarting the ADB server (adb kill-server && adb start-server) – did not help.
Running the stock OS and updating the system – I performed an update through System Update, but the problem still exists.
Checked in dmesg (Linux) – with much effort, the phone briefly appeared but then disappeared again.
Additional suspicion:

It is possible that the problem is related to the version of the bootloader:

Bootloader version: 12059390 (after System Update it is 12474670)
OS version: Latest stock update downloaded via System Update

On devices with bootloader versions 11693900 and 11388194, everything is going smoothly.

Has anyone experienced a similar problem? Any help would be greatly appreciated.

Thank you in advance!