Default Updating rooted nexus 10

Im done searching, i cant make any sense of it. im a new android user and i just want to update my device from 4.2.1 to 4.2.2..

Ive tryed downloading it manually from and install it when from (when the tablet is shutdown and i hold both 3 buttoms and come into a boot screen??) i dont know the name of it but anyways. i select install zip from sd card and i then select the file ive downloaded but the installation aborts. i read in some thread that if i have a custom kernel ( i have francos) it cannot install updates that way?

Could someone please describe to me how to install the update in NEWBISH l​​languages?
If i have to remove franco kernel to install the zip file how do i remove it?
Please answer in simpel steps