@SocorroC 

Hi, Welcome to the community.

the firmware downgrade needs to be done via firmware recovery:

How to use firmware recovery

It is also suggested to refer to the following troubleshooting advice:

Fix unstable connection when connected to the Deco network (case one)

And our engineers have paid high attention to the 1.2.0 firmware feedback. if you would like to spend a little more time, I would like to forward your case to the senior engineers directly. Could you please help me check the following details:

1. May I know who is your internet service provider?

2. Would the main Deco XE5300 turn red when the internet dropped out?

3. Could you please save a screenshot of the IPV4 page under Deco APP>More>Internet connection when the internet dropped again?

Thank you very much.

Best regards.

  @maheshgv 

Hi, welcome to the community.

I also checked your post on the US station and so far, I think it might still be too early to say the disconnection is caused by the 1.2.x firmware upgrade.

@NBsr70  I noticed your description is quite like maheshgv and both of you have 5*Deco XE5300. You both seemed also mentioned the disconnection might be more related to one satellite Deco XE5300.

Later if you do not mind, I would like to follow up on your case via email so that I could forward the cases to the engineers if needed.

PS: In case you don't have enough time for troubleshooting, the firmware downgrade from 1.2.2 to 1.1.11 could be accomplished via firmware recovery-HTTP Uboot Method.

At the same time, could you please help me check the following details:

1. Did all the Deco units keep solid green during the disconnection?
2. Would the disconnection be more frequent on one satellite Deco XE5300?
3. Did the disconnection randomly happen to all the mobile clients, or mainly on several devices?

(If mainly on several devices, can I have their models?)

Wait for your reply.

Best regards.

  @Snap 

Hi, welcome to the community.

If the issue started with 1.1.11, your case might be a little bit different from others.

Can I have more details about the disconnection issue? like the LED status on each Deco? would the disconnection happen to all the mobile clients or mainly on several devices?

It would be highly appreciated if you could refer to this link Fix unstable connection when connected to the Deco network to help me check which one is quite like your current issue.

And @BigfootDouble Hi, Thank you very much for the feedback. Since the current information is quite limited, could you please refer to the above information to help me confirm more details as well?

Can I have more details about the disconnection issue? like the LED status on each Deco? would the disconnection happen to all the mobile clients or mainly on several devices?

It would be highly appreciated if you could refer to this link Fix unstable connection when connected to the Deco network to help me check which one is quite like your current issue

@David78721 Hi, since Deco X55 used a different chipset solution and firmware 1.2.5 hasn't been released to Deco XE5300, Could you please start a new thread here with the following details, or you could also send an email to support.forum@tp-link.com:

1. Did you update the firmware 1.2.5 of Deco X55 from 1.2.2?

2. Could you please also help me check which description here is quite like yours?

3. Could you please refer to this link to help me get the current network map and signal source on the Deco X55, such as:

Wait for your reply.

Best regards.