Did I just brick a non-rooted device? I have a non-rooted Onyx Boox C67ML Carta running stock Android 4.2.2.

I just installed Orientation Locker. I transferred it from my phone using Shareit, but on my phone it had come from the Play Store.

Once installed, when I tried to run it, the whole device totally froze. See below for a picture of what it looks like.

When this device had frozen on me before, I had always been able to force a reboot by holding down the power button. That does not work in the current situation.

I carefully used a knife to take off the back cover to try and find the battery. The battery does not seem to be removable without physically breaking the device.

I suppose I could wait for the battery to run out. It was quite low when the incident occurred. It may actually be out already, and the device off, since e-ink screens may continue to display the last picture they showed when something goes wrong, even without power.

What should I do?
The device was not bricked. After a few hours I held down the power button again, and the frozen screen was replaced by the "no battery" screen. After charging, the device is back to normal. I caution users of this particular device not to use apps that try to force the systemwide screen orientation.

It was lucky that the battery was nearly empty when this happened. I suspect that if the battery had been more charged, the wait could have been significantly longer.