Getting error code 80070570 when updating to dp8.1.1

[kumar_rajan5000]

I am currently running dp8.1 on my Lumia 520 in India. When I try to update to dp8.1.1 then updates are downloaded but while preparing to install it shows is could not open update file error code 80070570.

What should I do.?
Pls help
Does anyone knows why I am facing this error. I have 2.48 gb free space in my phone.

 

[kumar_rajan5000]

After a hard reset,I was able to install smoothly.n now works fine