Preface. Bought the router in Japan (V2 Japanese version) - all device are japanese domestic devices and my location is Japan as well.

Out of Box it has 1.05 as firmware, it was stable. After upgrading to 1.1.1 our Macs were disconnecting and dropping internet connection, sometimes signal is full (couple feet away but pages are not loading) - Reset the config and reset up again without any luck.

Here are the setup

1. Setup SSID as independent for each band (Only has 2.4Ghz, 5Ghz-1 on) both using fixed channel with no interference on channel (used Wifiman to check these) - MLO is disabled

2. Mac was Wifi 6 and Wifi 6e, both experience random connection drop, disabling WIFI and re-enabling it works

3. It did not effected the iOS and iPadOS devices, Windows and Android devices. Only specific to Mac laptops and iMac (we have total of 5 machines - All M1s)

I can't roll back to 1.05 firmware for some reason after upgrading to 1.1.1 - Upgrade was done thru Web panel and not manual download. Is there a way for me to roll back?

Please assist.