unable to update z10

hiii... i have z10.... my phone software version is10.1.0.273. and it show a notification for software update version 10.2.1.2977. but i have tried a number of times to update but i am unable to do that. it downloads the update files and while installing after 90% it gives some error "software update was interrupted". i also tried to update via bb link but show shows a different update version but after 8% it gives error to check internet connection. guys ... plz help me to update my phone:

Hello and welcome.
What you need to do is to download an OS to update your phone. Then you can follow the guide listed in my signature. Look for the OS you want in this thread:BB10 Leaked/Beta OS - BlackBerry Forums at CrackBerry.com

thanx for ur reply... but i have a doubt...
will i be able to update future updates from my phone or i have to do it the same way every time to update my phone