About   Vorke  Z1 :

Note

OTA firmrware is not rooted, and it comes with ota, but if you flash the rooted firmware, the ota function won’t work.

You can only upgrade Vroke Z1 from Android Marshmallow to Android Nougat by flashing it with PC upgrade firmware below.

Android Nougat 

Vorke Z1 PC Upgrade Firmware (root)

http://www.mediafire.com/file/v442zw4wbs29y63/Vorke_Z1-rooted-PC-NMF26Q-20170701.121615.V0321.zip

Vorke Z1 PC Upgrade Firmware (unroot)

http://bit.ly/2qdFKku

Android Marshmallow

Vorke Z1 OTA firmware

http://www.mediafire.com/file/gio8xl9j1v5ugqc/Vorke_Z1-ota-20161124.160846.V0923.zip

Vorke Z1 SD Card upgrade firmware (rooted)

http://www.mediafire.com/file/7p7ujmhrjg9w1c7/VORKE_Z1_20161207_ROOT_SD.rar

Vorke Z1 PC upgrade firmware (rooted)

http://www.mediafire.com/file/9k5r28y1u8008t2/Vorke_Z1-ROOT-PC-MHC19J-20161207.102746.V0923.img