ASUS Zenfone Max Z010d - Bootloop problem So, suddenly my phone started showing, unfortunately, google play music has stopped and it did the same for almost every app..and restarted on its own...and after some research, I came to know that it went into a boot loop because it is continuously loading...and does not start after that.    

Android version: 6.0.1

With zero knowledge of android and two days of google search, I tried the following things, however, nothing has solved the problem and my phone is still not working.  

I tried:
1. ADB sideloading: I switched the phone to recovery mode, and selected apply update from ADB. I found the firmware file for my model from the official Asus site and executed the following command from my pc -
 adb sideload  UL-ASUS_Z010-WW-13.8.26.110-user.zip  

However, it showed the following error:
sideload error  

I was not able to find a solution to the error.  

2.Secondly, I tried  flashing the boot image available in the extracted firmware file as follows:   



Even after that...it kept on loading with the logo on the screen and never started properly.  

Maybe everything that I have said and done is wrong, and I am sorry for asking such a silly question. Please help me, to get my phone working properly.
Aside from ADB sideloading, there is a direct option on the phone called &quot;Apply update from SD card&quot; after entering fastboot mode. Maybe, you should try that.

Enter fastboot mode by pressing the Volume down and Power button at the same time.
Once you reach the main menu, look for the above specific option.
On the SD card, the correct firmware zip file required for your phone should be present. Do NOT rename it or alter it.
After entering the option, locate the firmware file on the SD card and select it, apply the changes.

If the problem still persists, I think you should dig deeper into how to unlock the bootloader of your phone.