UMI when you are releasing a new update to fix system errors, battery, etc ... When you create a product the consumer believes it is good but you do not improve the smartphone I was disappointed to have bought ... MY OPINION...
Already being discussed here http://community.umidigi.com/thread-12199-1-1.html Making more threads about update won´t make it release any sooner. The answer is when it´s done, my opinion is very soon. The OTA update for UMI Z Pro was released today. Since UMI Z Pro and UMI Z are almost identical I believe they share most of their codebase, so the update for the regular Z should come soon.