Copy the Resurrection Remix ROM and GApps zip file to your SD card or internal memory (By using a USB cable or via adb push command).Just replace the Custom ROM zip with the TWRP zip) Zuk Z1 Resurrection Remix Marshmallow ROM flashing guide:

(Although the guide is for Custom ROM installation via TWRP but it should work just fine for the TWRP installation too. – To flash the recovery flashable zip follow the Custom ROM installation guide using TWRP recovery. – To flash the RAW TWRP image you can use flashify or follow the TWRP Installation guide Using Fasbooot If you have not yet installed a custom recovery on your Zuk Z1 then follow the below links to get it done: Install Custom recovery before you go for flashing Zuk Z1 (Codename: ham) Resurrection Remix ROM: If you want some more ROMs for the ZUK Z1 then here is the ZUK Z1 forum link. – Follow this guide to flash TWRP: Install TWRP using Fastboot (This requires an Unlocked bootloader on Zuk Z1) Required Files and Links for Lenovo Zuk Z1 Resurrection Remix Marshmallow ROM flashing: Neither the developer nor we will be held responsible for any disaster that happens to your device. You are the only person doing changes to your phone and I cannot be held responsible for the mistakes done by you. Before proceeding further you may consider backup your all data. Installing custom ROM requires a custom recovery to be installed on your device, which may VOID your warranty and may delete all your data.

Resurrection remix 6.0.1 gapps