Regarding an issue with Chromecast 2nd gen and Chromecast Audio

[GoogleNestTeam]

Update 3/20/25

Hey folks, 

If you previously performed a factory reset, we’re happy to report that the Google Home app update will reach all users today.

Please make sure you’re on version 3.30.1.6 for Android and 3.30.106 for iOS to set up your Chromecast (2nd gen) and Chromecast Audio. Check out this help center article if you need help updating the Google Home app.

If you’re still experiencing problems during setup, please reach out to customer support for further assistance. 

Thanks again for your patience while we worked to resolve this issue!

------------------------------

Update 3/17/25:

Hi folks,

Thank you for your patience as we worked to resolve the issue with Chromecast (2nd gen) and Chromecast Audio devices. As of today, this disruption has been fixed.

If you did not perform a factory reset, your device should now function normally. If it is still not functioning as intended check the firmware version of your device by following the instructions here. If your device is not on the corresponding firmware version, please try rebooting your device to start the update process.

For users who have performed a factory reset, you will need to update your Google Home app to the latest version (3.30.1.6 for Android and 3.30.106 for iOS) to set up your Chromecast (2nd gen) or Chromecast Audio device again. The app roll out has begun and may take a few days to roll out to everyone. We’ll post a confirmation once the roll out to all users is complete.

We sincerely apologize for this disruption and any inconvenience it may have caused, and we are committed to ensuring all users are back up and running as quickly as possible.

------------------------------

Update 3/14/25:

Hi everyone,

Thank you again for your patience, we have some good news - the fix should reach all users today. If your device has received the update it should be on the following firmware versions:

Chromecast (2nd gen): Firmware version 1.56.467165

Chromecast Audio: Firmware version 1.56.467166

Check the firmware version of your device by following the instructions here. If your device is not on the corresponding firmware version, please try rebooting your device to start the update process.

Please note: If you performed a factory reset during the troubleshooting process, you may still be experiencing an issue where you cannot re-setup the device. The team is working diligently to resolve this, and we will provide next steps as soon as possible.

------------------------------

Update 3/13/25:

Hey everyone, thank you for your patience while we work to resolve this issue. Here’s the latest:

We have started to roll out a fix for the problem with Chromecast (2nd gen) and Chromecast Audio devices, which will be completed over the next few days. Your device must be connected to receive the update.

If you performed a factory reset during initial troubleshooting, you may still be experiencing an issue where you cannot re-setup your device. We are working to resolve this as soon as possible. Please continue to check the Community page here for updates and next steps.

------------------------------

Update 3/11/25: 

Hi all,

An update on the situation: the team has identified the cause of the issue impacting Chromecast (2nd gen) and Chromecast Audio devices.

Please do not factory reset your device. If you previously performed a factory reset during troubleshooting, you may also be experiencing an issue where you're unable to re-setup your device. The team has identified the cause for this as well and is currently working on a fix.

We’re working to resolve this as soon as possible, and will keep you updated when there is more to share.

We sincerely apologize for the inconvenience, and appreciate your patience in the meantime.

Thank you.

------------------------------

Hello,

We're aware of an emerging issue impacting Chromecast 2nd gen and Chromecast Audio devices, and we are working on a fix.

Do not factory reset your device - we will keep you all updated when the fix rolls out. If you have already factory reset your device, we will provide instructions to set your device back up as soon as possible.

Thank you for your patience.

[Airlala]

Same here

[CaroShak]

Same, received the following:

Untrusted device. Chromecast couldn't be verified. This could be caused by outdated device firmware.

Did a factory reset, now I'm getting:

We couldn't authenticate your Chromecast. Please visit support.google.com/chromecast for help troubleshooting this issue.

Device: Chromecast 2nd Generation

Region: UK

Firmware Version: Unknown

[Guille1]

Me pasa lo mismo exactamente  igual 

[Aninlia]

Mine is 3rd gen chromecast, from indonesia using android.

I have done factory reset multiple times, i reinstalled google home app to my 2 android phone. When i tried to add device, 1 phone giving signal and showing setup code but then showing error "we couldnt authenticate your chromecast" and other phone not showing signal and showing "we couldnt communicate"

[Kamalakar1857]

Having the same problem from yesterday. 

[Artemise1220]

Tried factory reset, and no longer able to authenticate Chromecast. Tried making support ticket and system seems down, call back options all fail.

[Bogie23]

I'm having the exact same problem.  I was streaming TV then suddenly I couldn't cast anymore.  I tried several apps that I cast from and nothing.  So I did like you did, factory reset, deleted the device and tried to re-add and it says "authentication failed".

[DebWilly]

I am in Australia. Not sure of generation or how to find it. 

Something interesting, before I performed a factory reset, the chromecast ambience was still on the screen, with the current temperature, but instead of displaying my home device, (debs_bedroom in my case) it was displaying Google. Could not access any streaming or audio services.

After performing a factory reset authentication failed. I then checked my router and the device debs_bedroom was still displaying in my router. So I rebooted my router and my phone (android) and the device was removed from the router but still an authentication error.

Another factory reset on chromecast and reinstall of Google home and adding device still had same authentication error message when trying to add to the network. Google home found the device but would not authenticate.

I suspect a software update of some kind has created this problem especially with the timing and as so many others are experiencing the same problems.

Looking forward to a solution!!!

[Weiyap]

Same issue here in the UAE. Exact same steps tried but returned with Authentication Error

[Joshscott594]

NC2-6A5

Not available in Google Home, casting claimed it's an untrusted device. Factory reset now it can't be authenticated 

Victoria Australia 

[Turbz]

Has urs worked yet? I'm in melbs and just turned it on after being away and it's not working. 

[Lh2025]

I'm in the UK using a Chromecast device that is at least 10 years old, I don't know the number. Morning of March 9th it worked fine, yesterday evening and today says it's an untrusted device. I tried resolving it via Google Home to no avail. Unplugged and restarted my chromecast several times. Unplugged and restarted my wifi. Still not working. Thank you in advance for any info.

[Lh2025]

Also some more info if it helps: the chromecast shows up on my tv but my device (iphone) says it's an untrusted device/ firmware problem.

[AnnalisaF]

Same error,  not connection,  restarted and than star a new configuration.  Now error to configuration...

Model NC2-6A5

From Italy

[Ranieri83]

Same problem here from Italy. No cast. Reboot. Factory reset. No authentication.

[Melissapuccinil]

I did all that, too.  In Canada 

[LuciaC]

Yo lo re inicie y ahora ya no puedo establecer la conección de mi teléfono al Chromecast me dice que verifique en el centro de ayuda al usuario y no logro conectar el dispositivo 

[Bellaarevalo12]

Me pasa lo mismo, al parecer es algo mundial, por todos los comentarios de este hilo 😧

[Rgnb92]

Me pasa lo mismo

[Foodiegaluk]

Hi,

UK here.  Same problem as everyone.  It's connected on TV but unable to cast. 

Cast firmware- 1.56.275994

Everyone asking how to find firmware info-

Go to Home > Devices > choose your chromecast name > Top right corner choose the settings icon (next to 3 dots) > Device information > scroll down to Technical information

[KleeSmiff]

Half of us have done a factory reset so our device isn't listed on our app anymore. 

[AbhishekPatra]

Same issue. Getting the authentication error when I am trying to setup the Chromecast after resetting the factory settings.

[Wendyf]

My chromecast is removed, can not even find it anymore, two of them!

[Santoshcattavar]

Hi JillG, 

Thank you for escalating this issue.

I am from New Jersey, USA.

I tried factory reset and restarting my router. But getting the same authentication error on my Google Home app. I am using an old Chromecast model NC2-6A5. How do I find the firmware version? Home is not showing any option to check this. 

[Emma10]

I'm from Argentina, I have the same problem. I own several gen2 devices. 

[Lalyc0]

Pense que era la unica desde hoy a la tarde... Espero que lo solucionen pronto. 

[MagdaL]

Te pasó lo mismo con todos o solo con uno? Se te soluciono? 

[Ss09]

I am also in NJ and having the same issues.

[Gaurav9712]

Same after resetting it's not authenticating.

[CEinCville]

Seems this is happening all over the world. Could my Chromecast device have expired? Worked fine last night. Don't know how to find the details on it to send you. Have unplugged, waited, reconnected, etc even factory reset. Chromecast shows up on my TV but Google home says it's offline, which it clearly is not. I think the problem is with Google home not the Chromecast device.  Tried customer support on the phone got cut off and they won't let me call again.  Can't believe how dependent I am on this product! If it doesn't work I would need to cancel all my streaming services... 

[Wad4]

Indeed. I'm in Lebanon. Chromecast 2 was working just fine a couple of hours ago. Then it stopped communicating with my phone. Tried to unplug, wait, factory reset. But I cannot reset because it cannot "authenticate". Obviously a problem that Google needs to resolve or at least provide feedback on!!

[cbgwtch]

A tech product shouldn't expire! If this is planned obsolescence of the 2nd gen Cromecast then I'm not going out to buy a new one, I'm going to get a competitor's casting device. I don't WANT to do that, though, because I liked my trusty 2nd gen just fine until an hour ago, when I performed a factory reset like the rest of us to poor results. I'm hoping it's an issue with a Google Home app update that can be quickly resolved. Any communication at all from Google could have prevented me from forcing a reset. I feel like the new kid in school getting hazed by being encouraged to check out the pool on the roof. 

[Airlala]

Same here very frustrating 

[Lh2025]

Same here, the chromecast shows up on my tv but my device (iphone) says it's an untrusted device/ firmware problem.

[Katte]

Same problem here. Hope it’s an outage they are working to patch. I don’t have money to get a new device.

[Karlarosarosa_]

O Chromecast parou de transmitir então eu reiniciei, só que na hora de configurar dei a mensagem que não podia ser autenticado e que eu devia contactar o suporte google

[Roberta_Rivas]

Aconteceu o mesmo comigo. Não sei o que fazer e nem acho as instruções em lugar nenhum

[MarianaG]

O mesmo acontecendo comigo .

[Samara3]

Aqui está o mesmo 

não sei mas o que fazer 

alguém conseguiu resolver?

[Kaarel_Carlotto]

Mesma coisa aqui.

Já reiniciei várias vezes e não deixa mais instalar. Só fala desse negócio de autenticação.