From this post, you get a good BLU ZOEY SMART Firmware stock ROM and approved perfectly from the source ZOEY SMART Flash File with flash tool, USB driver, and how to flash.
KaiOS is a light operating system for smart feature phones which require limited memory, while still offering a rich user experience through access to apps like Google Assistant, WhatsApp, YouTube, Facebook, Google Maps, and Twitter.
BLU ZOEY SMART Firmware