It’s on rest mode and it won’t turn on, I can’t restart it because it just keeps blinking no matter how long I hold it down for, I tried removing the battery and then plugging it back it but it didn’t work. Before when it was working it asked to download something and I pressed ok and then it froze on my Lock Screen and I held down the power button to restart it but then now it won’t turn on and the power button is just flashing, please help if you know how to fix this