Do not try to do something yourself. Send technical service
My mi 5 was rooted and was installed with aosp rom. I downloaded a battery calibration app, where it was instructed to start calibration and then when the phone switches off it should be charged to a 100 percent. I had unplugged my phone at 97 percent, but I couldn't switch it back on. There were no leds or anything. I also tried to charge it but now it wouldn't show anything . How can I fix it?