Brume 3 GL-MT5000 firmware 4.9 Drop-in Gateway not work

Hello,

After updating to firmware 4.9, everything stopped working.
My configuration is Drop-in Gateway on my main router, with the Brume 3's IP address set as the gateway.

It has worked perfectly since I got it, but after updating to 4.9 not work, even after resetting to factory settings and configuring again, it no longer works.

If I leave the Brume 3's IP address as the gateway, the clients lose internet access.
I have no access to the Brume 3 from the main network... basically, Drop-in mode isn't working. I suppose the firewall rules are faulty in this 4.9 firmware.

No DPI work.

Only work Adguard home(dns)

Due to duplication, merged into