Yep, I have the same problem with reboot loop after updating mt-toggle and the 4 toggles. And when I have plug in the a/c that seems to finally get to the menu.

The other trick that seems to work is to get the SIM card out during the starting process and then to get it back.

I have tried 3 or 4 reboot to see if something have made the trick but unfortunately, each time the infernal reboot loop start all over again...

Hope that help

Edit : oups, sorry I didn't see your last reply, well that explain why the SIM card trick seems to work