FritzBox4040 upgrade from 23.05.2 to 23.05.4 fails

Hello
i have two FritzBox4040 for WLAN. I have tried upgrading one of them from 23.05.2 to 23.05.4. After reboot the 4040 was not available with ping / http(s) / ssh anymore but is working in serving WLAN. I can see the device with its mac. How i can access the 4040 again without flashing again. I did this already several times keyword "dsa" and "swconfig" etc. and dont want to do this again..
I have read on https://openwrt.org/releases/23.05/notes-23.05.4#upgrading_to_23054 that a upgrade from 22.x ist not working properly but 23.05.2 to .4 ? However i can't find any information on the device site https://openwrt.org/toh/avm/avm_fritz_box_4040?s[]=fritzbox&s[]=4040 regarding changing something in uboot-Parameters. I know that vlan1 is hardwired in the device. I am using vlan10 for accessing (mgmt) the device.

Maybe some other had same issue or know how i can debug that easily. How i mentioned: The device is working with WLAN without any issue. But is comepletly not accessible anymore. The second 4040 is on 23.05.2 and is working without any issues.

here are some of the last changes
https://git.openwrt.org/?p=openwrt%2Fopenwrt.git&a=search&h=refs%2Fheads%2Fopenwrt-23.05&st=commit&s=FritzBox+4040

looks like the mac address was fixed just b4 23.05.5 starting compiling
if it's setup as an AP via DHCP maybe it just has a new IP