How to flash ExtendedUIReborn

1) Reboot to recovery
2) wipe system, data, dalvik&cache partitions. (only format data if needed, probably not needed!)
3) flash ROM and Recovery (I use SHRP, TWRP should work fine too)
4) reboot to system (it should automatically change slot, if not change it manually)
5) enjoy!
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Gapps included!

If you cannot get past setup wizard on first bootup, just skip it and give required permissions to Google play services (it will automatically pop up as a notification).