Tried to change one of the settings in my iCab web browser this morning on my iPhone XS, I'm now getting a permanent black screen with a spinning wheel. Holdingthe power button and volume down buttons simultaneously doesn't do anything at all. Neither does plugging the phone into itunes. Have I bricked it? Luckily the phone is still under warranty but i would prefer to avoid the hassle of sending/taking it to Apple if i can somehow fix this myself. Everything is backed up. Any suggestions?