Xiaomi Redmi 4 Pro Bootloop

May 1, 2018
This morning I tried to restart my Xiaomi Redmi 4 Pro but has entered a phase of bootloop. I'm not at all accustomed to modding, and I can not understand by what it was caused since I've never got into modding and I stick with his original ROM and recovery. And now I don't know what to do.
In total despair I searched for a guide on how to enter recovery mode to try to restart the phone manually, and by pressing the volume up and power keys I entered a mode with lots of orange and Chinese buttons and a central blue button at the bottom; I translated the various writings with the translator and there were written, under the blue button, the word "fail" followed by some tests. I opted for the blue button that turned off my phone. Trying to turn it back on, the phone is back in the bootloop phase. Please give me a hand as I do not really know what to do. And sorry for my bad English too.