I tried downgrading after resetting to factory settings, but the same error persists. It says there’s an issue with the configuration.

So now I’m stuck with a router that freezes and no way to downgrade.

  @tapac3 

  @YuriyB I installed the beta firmware on the main router, and it has stopped freezing.
The satellites are running the latest official firmware and are working fine.

So, it can be concluded that the latest official firmware doesn’t function properly on the main router.

 

It seems I celebrated too soon. The main router is still freezing, although not as frequently as it did with the latest official firmware.

  @tapac3 so it is your local problem, I have two c64's in mesh working 24/7 for two months with 11 clients on this beta firmware with ZERO problems.

Yes, this is a localized issue, which is why I was asking for help with downgrading.
I don’t know exactly what was updated in the new firmware or why it doesn’t work with my setup.

I have three Archer C64 routers, two of which act as satellites.
On firmware 1.13.3 Build 240223 Rel.60864n(4555), everything was working perfectly.

However, when the update was released, I encountered a pop-up in the web interface that I couldn’t close.
It gave me two options: Update Now or Auto Update Later.

In other words, I was forced to update the firmware, and now I have a device that doesn’t work properly.

  @YuriyB 

I’m glad everything works for you, but that doesn’t mean the problem doesn’t exist.

I have a custom DHCP setup and a different routing table, which could be factors.

Also, I have no idea how you’re managing to work with the beta firmware.
At the very least, the background image in it is incredibly annoying.

  @terziyski 

For obvious reasons, I can’t show how this window looked on the previous firmware version.

However, it appeared immediately upon logging into the router.
The background was dimmed, making all content behind the window inaccessible (no links, no text selection, etc.).

The window couldn’t be closed and displayed a message that a new firmware version was available, with only two options: Update Now or Auto Update Later.

But if you want to see how this window looked without the dimming effect and background blocking, you can type the following into the browser console (on the router's index page):

$('#update-fail-msg').show();

But that’s not the main issue. The main problem is that I can’t even install the previous firmware version, even if I’m willing to lose all my settings.