The phone worked 2 days after which the top speaker stopped working, but on day 3 he woke up for a couple of hours, after which he turned off again ... (the tests of the speaker itself are failed, the rest of the phone works.
Семен replied at 2017-7-30 18:19
Edited by Семен at 2017-7-30 19:10 \n\nWill it help me to upgrade to android 7.1.1 ???PlEASE H ...
Is always worth to try.
But I would use SPFT and flash flash complete ROM. http://community.umidigi.com/thread-11-1-1.html
And here you have all available ROMs http://community.umidigi.com/forum-150-1.html
Also if you want you can perform factory reset (settings - backup and reset - factory data reset) and then check for updates (settings - about phone - wireless update - check for updates)