This ROM is in the canary test and NOT STABLE.
You flash this rom on your own respondibility.
Someone have got stuck in a bootloop.
The default language is Chinese.
Flashing this ROM will convert your ZUK Z1 from COS 12.1 to ZUI, and the bootloader will be replaced and locked.
If you want to go back to COS, you can search for help in this forum.
NOW you can install the gapps, and they can run well.Download the newest version (ZUI 1.5.201).
Because ZUI recovery's device code name is K9, TWRP recovery's device code name is ham, if you flash it by TWRP recovery, you must modify the script.
How to flash:
1. convert to ZUI:
How to flash ZUK Z1 ZUI version 0.9.084_ST_150729
2. Download this rom.
3. Rename the rom file to update.zip, and put it into /sdcard .
4. Boot into ZUI recovery and full wipe.
5. Flash this rom and reboot.
I tested this rom, and it works well. I flash it by TWRP recovery (I modified the script).
For first boot, you may wait for 10+ minutes.
ZUI 1.6.225 official ota url
ZUI 1.6.225 Baidu Colud Disk(This is a Chinese website.)