Default [Q] How to make flashable for adb sideload?

I try to make flashable for stock recovery 4.4.2 apply ADB but .it's show error E: Footer is wrong what's worng.update.zip can flash via other recovery such as TWRP/Philz.

Mobile :LG G2
Tablet : Nexus 7 2013 LTE
facebook : www.facebook.com/droidth