Hello everyone! I am having an issue with my iphone. I downloaded a tweak on my iphone and now I cannot get it to work. The iphone starts and the apple logo is displayed. Shortly after, the screen changes (becomes brighter) and then becomes dimmed. The apple logo is still displayed however nothing happens. My device is jailbroken, but it seems that I am having trouble booting into safe mode. ( I am trying the volume-up button.) Any advice? Thank you!