What's the way to upload my S3 os to kitkat version?

Question

I want to upload my s3 os to kitkat. could you please suggest the ways to update it

Answer 1

Software updates can be manually downloaded.
To check if an update is available.

1. From the Home screen, touch Menu > Settings > More > System Update .
2. If a system update is available, follow the prompts to download and install the update.

Answer 2

I`m using a HTC One and when I was meant to get updated, I received a notification asking me whether I would like to use the new version of Android

The transformation lasted for few hours, meanwhile my smartphone was off and I couldn`t receive calls or messages