Your problem is not related to esp32 or cc3200. The ESP32 variant wouldn’t have helped here. The bootloader is working fine.
It looks like you forgot to describe the c2.der in your latest writeup. You also did this?
First check if you are able to reach tc.fritz.box
Please remove those .revvox DNS entries, you don’t need them if you are using your fritzbox.
Be sure the toniebox is able to resolve the TC.fritz.box and is connected to the right wifi.
Adding this to your DNS server may help (depending on your configuration)
PS:
For the cc3200 you can always boot ofw1 to have a fully working box again.