UMI Z : MAJOR PROBLEM AFTER FIRMWARE UPDATE. NO VOLTE AVAILABLE.

Bst.sanyog

I purchased a UMI Z from aliexpress and have been using it in India since January.

I am using a Reliance Jio Sim Card which works on BAND-3, BAND-5 and BAND-40. The "VOLTE" Symbol on the top with the network bars disappeared after the V3.02_20170317 (Android 6.0) firmware for UMIDIGI Z update.


Since my sim card uses only the VOLTE technology for high quality voice calls this meant I was unable to make any phone calls from my UMI Z. I did recieve phone calls but as soon as I answered them I got an error message saying "no network available" and the call dropped/disconnected. After a lot of research I figured out that this problem had something to do with the ROM update.


After a while I got another update which was the V3.02_20170411 (Android 6.0) firmware for UMIDIGI Z but even this did not solve the problem. Infact the new updates promised GPS optimisation but they only made it worse.


After waiting for over a month for the "VOLTE" sign to appear automatically I decided to downgrade to the version V3.02_20170225 (Android 6.0) firmware for UMIDIGI Z which finally solved my probelm. I followed the instructions here to manually flash that rom and as soon as the phone restarted I had the "VOLTE" symbol and was able to make and recieve phone calls with no problem.


I would really want you people to look into this. The Android 7.0 update for UMI Z will be here anytime and I don't know how would that work for me. Would I have the same problem in Nougat too?


PS : I had checked all the settings when I lost the VOLTE symbol. Enabled 4G LTE as the voice call preference and made sure all the possible settings were right. It was the ROM PROBLEM and nothing else.

MarcinP

I would advice you to flash with SPFT to latest available firmware and then test VoLTE as we don't have such issues.

venki6133

Yes im also facing same problem with using JIO Sim I get incoming calls but ... No outgoing Calls i done all the change but i dint get VOLT service with new update please look below thread to get more info on VOLT Issu     http://community.umidigi.com/for ... thread&tid=7170

Bst.sanyog

MarcinP replied at 2017-5-9 03:12
I would advice you to flash with SPFT to latest available firmware and then test VoLTE as we don't h ...

Hi,
According to your advide I flashed the latest ROM with SPFT thinking that the OTA download could have been corrupt. It did not solve the problem. I had to downgrade again to V3.02_20170225 (Android 6.0) firmware for UMIDIGI Z and as soon as the phone restarted after the flashing process there it was the "VOLTE" symbol with crystal clear calls.



I have checked and have seen that a lot of people have been facing a similar problem all across the world with the phone after the ROM update. I am sure this is a ROM problem.


I would please request you to look into it ASAP beacause this is completely spoiling the experience for us. The new ROM gave me a better camera but I cannot upgrade now and I am kind of stuck with this ROM not knowing what will happen once the NOUGAT update hits the phone.


Is there any other troubleshooting you think can be done here?