GrapheneOS changed the title to Workaround for Android 15 QPR2 fingerprint firmware glitch on Pixel 9 (non-Pro) .

@GrapheneOS , you are mentioning that it is "a glitch occurring for certain Pixel 9 (non-Pro) users resulting in the fingerprint sensor not properly resetting itself after being updated"

If this issue persists for an extended period, do you think a complete reinstallation of GrapheneOS would resolve it permanently? The rationale is that a fresh installation would ensure the fingerprint sensor receives the correct firmware version from the start.

Currently, the issue is more of an annoyance than a major problem for me, but I'm asking in case it continues for weeks.

    Franco if it helps, I have tried this and still had the problem. So I would hold fire on reinstalling GOS as it does not seem to fix the issue.

        Lilac6044 Thank you for your reply. In that case, we can only hope that the issue will be resolved upstream eventually.

          My Pixel 9 is affected by this and I can't seem to get the sensor to come back. I am getting this error from fastboot oem udfps status:

          $ fastboot oem udfps status
(bootloader) invalid sentinel 0x0
FAILED (remote: 'failed to print status -7')
fastboot: error: Command failed

          The calibration image URL is this, which gives a 404 error.

          $ fastboot oem udfps get-cal-url
(bootloader) https://storage.googleapis.com/hardware-mfg-data-ext-sacal/d9010017100086.signed.cal
OKAY [  0.001s]
Finished. Total time: 0.001s

          Any chance someone with a working Pixel 9 fingerprint scanner can try those commands and paste their output?

            NO FINGERPRINT option...

            Just flashed a new P9 and it installed build 2025030900 from the website installer... and on first boot there was NO option to install a F. P. unlock... and in the settings it simply isn't there... I wonder if this is effecting more than first thought...

            VAULT

              I'm having this issue too. It seems to randomly occur. I seem to have better luck fixing this temporarily by shutting it down instead of rebooting it but it is completely unpredictable. Pixel 9 as well.

              GrapheneOS FWIW, I've been unable to fix the issue permanently. Every so often it goes away when I boot the phone back up and remains fixed until the next reboot, but I haven't been able to have it go away completely.

                  Pixel 8 fingerprint can be used to unlock screen. The fingerprint for apps in personal profile need to be setup again. In the work profile its not possible to set up the fingerprint unlock for apps. I always recieve an error.

                    After many many times of reboots, sadly my fingerprint isn't back yet. Seems like i hit the jackpot.

                    tavianator
                    I ran these commands in fastboot mode and get following logs on both of them:
                    FAILED (remote: 'Unable to do OEM command Status(-8, EX_SERVICE_SPECIFIC): '1: Error Unknown OEM command'')

                    My fingerprint failed to but after rebooting many times (stopped counting on 16 times) it worked again, but the last reboot after it worked again my phone rebooted itself while I wanted to unlock my SIM.

                        Pixel 8 Graphene OS 2025030900
                        So far lock screen and personal profile work fine. Apps installed in work profile don't work, though they'll prompt for fingerprints, either nothing happens, or they give an error.

                          domnru Huh, that's strange. Hate to ask this but are you sure you spelled the command the same way I did? Thanks for trying it anyway!

                              tavianator Did it again by copying the command, same result.

                              $ adb devices
* daemon not running; starting now at tcp:5037
* daemon started successfully
List of devices attached
here_some_id	device

$ adb reboot fastboot
$ fastboot oem udfps status
FAILED (remote: 'Unable to do OEM command Status(-8, EX_SERVICE_SPECIFIC): '1: Error Unknown OEM command'')
fastboot: error: Command failed
$ fastboot oem udfps get-cal-url
FAILED (remote: 'Unable to do OEM command Status(-8, EX_SERVICE_SPECIFIC): '1: Error Unknown OEM command'')
fastboot: error: Command failed
$ fastboot --version
fastboot version 35.0.2-android-tools
Installed as /usr/bin/fastboot
$ adb --version
Android Debug Bridge version 1.0.41
Version 35.0.2-android-tools
Installed as /usr/bin/adb
Running on Linux 6.13.6-hardened1-1-hardened (x86_64)

                              Meta:
                              Arch Linux fastboot version 35.0.2-android-tools
                              Bootloader version: ripcurrentpro-15.2-12817298

                              My fingerprint worked, after rebooting again it doesn't anymore.
                              The universally fix is not rebooting x amount of times.

                                I got a pixel 9. Shutdown and/or restarted about 7-8 times and then it worked. I had to go into settings to re-activate the fingerprint unlock. good luck.