

Nithin, Thank you Jeep and Gourav for your help. moreDo Hard Reset>let install previous OS 8.1>go to store download update adviser>run update adviser>follow all the step>go to phone update>let install Windows 10>after complete installation>go to system>about>more info>check out OS build 104>go to setting>update security>phone update>new OS build available to install>let complete the installation process>Go to system>about>more info>check out OS build 164>reset your system>let complete the installation process>update all existing apps>enjoy lag free Windows 10 and feel the difference.My Lumia 640 XL performing perfectly no issues till date.Battery backup issue is common with all Lumia Smartphone running on Windows 10 OS even 950 & 950 XL and 550 having less battery backup and will be fix with the coming update relax and update your Lumia devices.We have to agree that Microsoft is much concerned about it's devices performance that why he rolled out Windows 10 for the selected devices only.And work hard for the rest devices. Annoymous, hey friends, all those who have upgraded to win 10 on 830,i want a detailed review of camera.
