The most interesting feature regarding this file format is its capability:
The system maintains two separate partitions (A and B). While you are using partition A, the AB-GOTA.zip file installs the new update to partition B in the background. You only experience a brief restart to switch to the new version. AB-GOTA.zip
Are you trying to this update on a specific device, or A/B (seamless) system updates - Android Open Source Project The most interesting feature regarding this file format