Asus zenfone 2 laser ze550kl firmware download path

Please find the Asus zenfone2 laser firmware download path in the below
https://www.asus.com/Phone/ZenFone-2-Laser-ZE550KL/HelpDesk_BIOS/
In the above path it will show the Drivers and Tools section and below the drivers and tools has Please select OS drop down and select the option android and it will display the firmware link. Click the firmware link and it will list all the firmware versions with the firmware information and also the firmware download link.
Please find the Asus zenfone2 laser forum path in the below
https://www.asus.com/zentalk/in/forum.php?mod=forumdisplay&fid=138&page=1

Zenfone 2 Laser volte update battery draining issue

After updating the zenfone 2 laser to the version WW_21.40.1220.1998 battery draining fastly. I have done so much of research on the battery draining like clear the cache, recalibrate battery, deny apps to auto start and so on but of no use.
While checking the default apps updates I have uninstalled the updates for some of the apps and forget to update them to latest version and using the phone asusal and came to know that battery draining is not happened after that. So I thought some of the default apps updates causing the battery draining fastly.
Please find the apps for which I have uninstalled the apps. mobile manager, clock, calculator, flash light, google play music, mini movie and super note. .
So I thought I will share my experience which will help for some of the users..