Hi
If is not showing any FOTA update please follow this thread http://community.umidigi.com/thread-6588-1-1.html
And use SPFT or OTA zip update.
OTA zip file is exactly same update as FOTA only difference is that you need download and place file manually.
Hi Probably if you wait another few days you will get FOTA update automatically. But as you want update now you can use OTA zip file.
Every latest umi phone is getting FOTA updates automatically but could be some delay between devices.