[Q] "Authentication Error" WiFi after updated to Android 5.0 Lollipop - Nexus 5 Q&A, Help & Troubleshooting

hello,
I updated my Nexus 5 with Android Lollipop (no OTA) and since I can't connect to the WiFi in my work.
I get the following error: "Authentication Error"
Before the update,it worked without a problem.
Can you please help me?

youv said:
hello,
I updated my Nexus 5 with Android Lollipop (no OTA) and since I can't connect to the WiFi in my work.
I get the following error: "Authentication Error"
Before the update,it worked without a problem.
Can you please help me?
Click to expand...
Click to collapse
Same issue here.
If I disable and enable, the wifi works again, but i rolled back to kitkat because the lollipop doesn't have a stable network (sometimes uses the mobile network even when wifi is available).

I am seeing this too.

Make sure you're router is not set to.use channel 12 or 13

check this post by @androidizen maybe it will help you guys
http://forum.xda-developers.com/google-nexus-5/general/android-5-lollipop-wifi-bug-fix-t2938592

Info
youv said:
hello,
I updated my Nexus 5 with Android Lollipop (no OTA) and since I can't connect to the WiFi in my work.
I get the following error: "Authentication Error"
Before the update,it worked without a problem.
Can you please help me?
Click to expand...
Click to collapse
Set WiFi Router channel to Auto & Freq to 2.5GHz OR 5GHz (deselect both)
:good:

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After i found i can get a new software (4.4.2) i can t log into google play store ,it said "can't establish a reliable connection to the network "..
Maybe i get some help?
Harri2011 said:
hi , i have a LG G2 and my ex-software was android 4.2.2 ,i rooted it ,and it works.
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emeres said:
Hi,
I was trying to update my GS4 OTA to KitKat 4.4.4 but I had to cancel the update over WIFI and leave the house. When I tried to update it again it shows that my device is up to date. But it's still on 4.4.2.
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Click to expand...
Click to collapse
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Moto Z xt1650-02 wifi not working after upgrade to Android 8.0

Hey amazing people,
I have an urgent issue regarding my moto z xt1650-02, everything working fine until I upgrade to android 8.0 and after one week of upgrade problem started my wifi frequently disconnecting starting I have tried each and every help on the internet such as:
Cach clean
Factory reset
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mirza5313 said:
Hey amazing people,
I have an urgent issue regarding my moto z xt1650-02, everything working fine until I upgrade to android 8.0 and after one week of upgrade problem started my wifi frequently disconnecting starting I have tried each and every help on the internet such as:
Cach clean
Factory reset
Wifi preference reset
All app preferences reset
Try to unlock the bootloader via Motorola official site but there I got the message that "Your device does not qualify for bootloader unlocking".
So time wifi start working and next day the same condition toggling between saved or connecting but no interne, I can see all wifi networks but can't connect?
I hope anyone here resolves this issue to root or at least wifi in working condition?
Click to expand...
Click to collapse
Tried looking here
https://forum.xda-developers.com/moto-z/help
I would reflash the firmware
Just don't downgrade, use same version or newer.
sd_shadow said:
Tried looking here
https://forum.xda-developers.com/moto-z/help
I would reflash the firmware
Just don't downgrade, use same version or newer.
Click to expand...
Click to collapse
I am not sure what are you suggesting me? could you please explain further as I am brand new for these kinds task
sd_shadow said:
Tried looking here
https://forum.xda-developers.com/moto-z/help
I would reflash the firmware
Just don't downgrade, use same version or newer.
Click to expand...
Click to collapse
I had tried to flash rom but no luck, bootloader is locked and I don't have one to unlock the bootloader?
mirza5313 said:
I had tried to flash rom but no luck, bootloader is locked and I don't have one to unlock the bootloader?
Click to expand...
Click to collapse
As long as you don't downgrade you should be able to flash firmware
sd_shadow said:
As long as you don't downgrade you should be able to flash firmware
Click to expand...
Click to collapse
Can you please guide me step by step how to "flash firmware"?

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