I have multiple G5 in the company I work for and not issues so far with Oreo update.
Go to apps, and search for Google Play Store and Google Play Services.
On each app, go to storage and "clear cache" and "clear data".
This will reset apps as it was just installed in a new phone. It will update to latest version in a couple of hours.
Second option is to access phone in safe mode to see if you get the same issues.
- With the device turned on, press and hold the Power key.
- Tap and hold Power off.
- Review the message and tap TURN ON.
- The device will power off and restart in safe mode.Swipe the screen to unlock the device.
- To turn off safe mode, swipe down the Status bar.
- Tap the Safe Mode Is On notification.
- Tap TURN OFF.The phone will power off and restart.
- The device will reboot into normal mode.
I had already tried clearing the cache and clearing the data. That did not help. I rebooted in Safe Mode, and Google Play Services continues to crash repeatedly even in safe mode.
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Have you tried clearing the Cache in Recovery Mode?
This SHOULD always be the second step after going through a major Android update like you did. This erases any left-over from the update done.
This step will not erase files or apps, it will erase SAVED passwords and logins, so all your games and online apps will need to be signed in again. DO NOT do this step if you are not sure of our passwords.
I am also having problems with my LG G5 immediately following the Oreo update (last week):
1. GPS not working. I thought TMobile had fixed when we did a network reset, but it turned out not to be successful when I tried to use Maps and another GPS navigation system. (They keep reporting that they can't find the GPS signal.)
2. Headphone Jack not working. Music/phone calls continue to play through phone speaker, not headphones. From researching on another carrier's site, apparently Google decided to make the default for Oreo to have headphones turned off. But I could not resolve using the recommended methodology, because I cannot find sound.ui on the G5.
3. Flashlight does not work.
There's a rumor that Google will be issuing a fix in January, but I don't want to wait until January to have full use of my phone.
Other issues may surface, but those are the known issues at this time.
I have spent hours of my life researching online, speaking with TMobile's tech support, and talking with Techies, but to no avail.
Is it possible to undo the upgrade??