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!

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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.

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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.

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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.

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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.

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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.

[ofusco]

o meu tá literalmente assim agora!!

[Julie_K]

I get the same error after reset, that they cant accept the device.

Im in Jutland, Denmark, and i am using Chromecast model NC2-6A5 (i think its a gen 2)

We also have a Chromecast Ultra, which works fine - so it seems to be an older gen problem??

[Tobias1974]

Hi Julie

I can’t find it in the Google Home app anymore.. 

[Sanna1979]

Samme problem her. Den siger vi kunne ikke godkende din Chromecast. 

??? Vi har 3 i hjemmet. Og ingen af dem virker nu. Jeg kan finde dem på min skærm og i min Home app men den vil ikke godkende dem ? 

[SusanneM]

Du Gode, hvor er jeg glad for at se dit indlæg. Jeg har kæmpet i 5 timer her til aften - topfrustreret-for at få min chromecast til at virke igen - har prøvet ALT!!!!!  Intet virker! Og nu forstår jeg,  at der er andre,  der har samme problem. Så må der være en løsning? Hvordan får vi den? 

[Isabellabn]

I have the same issue. After factory resetting it it can’t reconnect. Says the firmware is untrusted 

Copenhagen Denmark. Model NC2-6A5 also:/

[da1man68]

Hi Julie,

I am using an NC2-6A5 currently I have the device offline right now. I had another device that has been offline and I plugged it in and that one is streaming now. But it is not added to my Home app.

[Dozo]

My gen 1 still works, but gen 2 won't 

[Radagast]

One of my devices is still working.

The other two started to fail yesterday by 19:00 GMT.

[Prolificrecords]

Yes how to fix 

[Santoshcattavar]

Thank you @JillG and Google. My ChromeCast is back to normal. 🙂👌

[Idita]

Sweden, Gen 2

Came home today, the phone showed me the Chromecast but failed to cast. Reset the device, now I find it 50% of the time, but get ”Unable to communicate with device” from both Android phone and iPad on the Home App. Restarted the devise again, my router, my phone, updated all applicable apps etc.

Someone said they rolled out a new firmware today and that made it crash, don’t know if it is true but it sucks. I requested 2 support calls but get ”I’m sorry, I cannot connect you to an agent, please create a new call request”. I now have 2 open cases… don’t ever expect to hear back from them.

[cahi01]

When I try to cast from my Chromecast second generation.

I get an error message.

"The unit is unsafe

(Name of that Cc).

Could not be verified.

The issue may be old firmware"

Help with this please

[CrisCr]

All my Chromecast devices stop casting due to an authentication/ firmware error message !!!

[Emijo]

Hi

Just now i have started to experiance there is an issue with the Gen 2 chromecast. I can not connect to it and after trying to factory reset two chromecasts I get the error that it can not be authenticated? Does anyone have a solution?

[angel79]

Same error now

[WillIV]

Haven't seen a solution yet. My ultra works fine but my older ones don't.

[Shnabehshan]

I have same problem 

[Linesjoelund]

Hej.

begge mine Chrome cast virker pludselig ikke.

de står som offline inde i appen, men jeg har genstartet både Chrome cast, router og telefon. 
har fulgt alle jeres fejlfindingsvejledninger, men uden held.

hvad kan jeg gøre?

[Sara2009]

Samme her, hvad jeg har kunne finde frem til er det noget globalt med en firmware opdatering… ved desværre ikke hvad løsningen er…

[cahi01]

Beror troligen på en firmware update från Google....😔

[Rohit7788]

Getting error we couldn't authenticate your chromecast. Please solve this.

[Ana2811]

Error de autenticación. Es como si no existiera. Home no lo detecta y si lo hace dice que no es un dispositivo seguro. Si no se arregla no volveré a comprar otro, que se olviden de mi. Alguien sabe que hacer?

[Gio9999999]

Bug after update 🤮

[Lazanha]

Meu Chromecast de segunda geração simplesmente parou hoje, do nada! Começou com uma mensagem de "essa conexão não é segura", daí resolvi iniciá-lo na versão de fábrica novamente. Porém agora não consigo terminar a instalação pois diz que não é possível conectar ao Chromecast.

Vi que outras pessoas estão reclamando sobre isso (sou do Brasil). Gostaria de saber o que fazer.

[Eduardo1117]

Aconteceu o mesmo agora comigo, será um bug da Google, esperemos que nos ajudem

[Lazanha]

Parece que é um problema global, vi muita gente no twitter de outros países reclamando sobre a mesma coisa! Preocupante!!

[Eriquemachado]

Pessoal parece que o dispositivo foi descontinuado e por isso não receberá mais atualizações. Tomara que não mas é o que já se vem falando desde o final do ano... o meu também parou 

[dianasribeiro]

Mesmo problema 😕. 

[Яісн]

Quise utilizar ahora mi chromecast 3 y me pide actualizar el firmware, lo reinicie y ya no quiso conectarse, como es posible que google no de aviso si va dejar sin soporte a uno de sus equipos.

[Rahimbhamani]

We are watching a movie via chrome cast 2nd generation. Suddenly it disconnected. I tried to restart the router, cell phone and cast but still issue. I default factory the setting it show we couldn't authenticate your chromecast. 

Please help

[BiRuTazezao]

Same in Brazil 

[Rankersbo]

Hi,

After cooking dinner we went on to the iplayer app and cast our programme only for the chromecast to not respond. It has stopped displaying our own photos and is now on a generic 

I tried going in to google home but it cannot detect our chromecast, nor can it detect any chromecast on our network

We can still see the chromecast connected to our wifi, it just can't be connected to by any other device.

[Smalls1]

Chromecast was working just fine this morning. All of a sudden stopped casting and now when going through set up says can't authenticate device. Yes I did a factory reset and still not working. I did try getting a phone call from google but of course it just drops me as it states cant connect call. I did try calling and also got no where with google.

[Poglander]

Same problem started here today with Chromecast gen 2

[Poglander]

Initially before the factory reset it indicated the firmware was out of date. Only way to view and update that is using Home app and that wont connect. Based on other complaints here, Google did something that broke this.

[lesnorman]

After years of good service Google Home is not connecting to Chromecast. I have reinstalled Home, rebooted the router, factory reset Chromecast but still no connection.  When home searches for devices a box says Cannot authenticate Chromecast. In Settings WiFi Chromecast shows as No Internet. Can anyone help me to reconnect please? Has the C device failed do yiu think? Thanks for any and every help.

[MarianaG]

Estou com o mesmo problema. Você conseguiu resolver ?

[Smwalker_79]

I’m having the same issue only with my iPhone, I get all the way through setup until it get to the WiFi and then tells me the TV might be set up but can’t communicate with my phone and then blanks out and I have to do it all over again 

[AndresCR2000]

My chromecast was working properly until a few hours ago. Right now it's showing up an error saying it's unable to autenticate chromecast. I did several factory resets and even the basic unplug and not working yet