I have Xiaomi Mi5 [ 32 GB variant running MIUI 8 with locked bootloader ]. As the storage space was running out, I deleted a couple of unwanted screenshots, old videos, and photos along with rarely used apps like Runtastic Running and Fitness, etc. Then I closed all my running apps, cleared the device's RAM using inbuilt Security app. All was fine till now. The problem arose after I rebooted my phone. Now my phone does not boot at all and is stuck in boot loop. The phone doesn't have a recovery of its own, and I can only access ADB Sideload. I have lots of valuable data in it. How can I recover those data? How to fix my phone? What could have caused the issue? Any help would be appreciated.