Last night my phone was set to install an update. Woke up this morning to the phone turning on, showing "Installing system update" and getting to 26% then rebooting and doing the exact same cycle.
Holding Power & Volume Down just restarts the cycle.
Holding Power & Volume Down & Home brings me to "WARNING A custom OS can cause critical problems in phone and installed applications. If you want to download custom OS press volume up. To cancel press volume down (restart)".
Holding Home & Volume Up then Power does nothing.
[Video of Cycle](https://streamable.com/au5mi)
Holding Power & Volume Down just restarts the cycle.
Holding Power & Volume Down & Home brings me to "WARNING A custom OS can cause critical problems in phone and installed applications. If you want to download custom OS press volume up. To cancel press volume down (restart)".
Holding Home & Volume Up then Power does nothing.
[Video of Cycle](https://streamable.com/au5mi)