Lenovo ZUK Z1 International Edition 4G Android 5.1 (Cyanogen OS 12.1) Phablet 5.5 inch IPS Screen Qualcomm 8974AC Quad Core 64GB ROM 3GB RAM 13MP Rear Camera 8MP Front Camera - White. The ZUK Z1 international version will be the first device from ZUK to come preloaded with the commercial Cyanogen OS. Combining Cyanogen OS 12.1 with the latest highest end hardware, the Z1 is poised to provide a fast, secure and beautiful device for Android users. Buy this Cellphone and Save $89.86 Off For Lenovo ZUK Z1 Cyanogen 12.1 Phablet 5.5 inch IPS Screen Qualcomm Quad Core 64GB ROM 3GB RAM 13MP Rear Camera. With Free Shipping.