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Hey guys, I've been using CM13 builds on my Nexus 6p for last few months. Generally, i flash new builds after 3/4 days from the last one. Everything's works fine, no big issues; but recently from last months build which ever update i flash on the device, the WiFi seems not working. It shows, it's on - Searching for Networks; but not able to connect or even find any network at all. And i tried to flash back to the older builds of CM13, the WiFi works fine on those builds quite fine. Beside this, I've tried Paranoid Android ROM on this device, WiFi works fine on that rom. So, have any of you faced such problem on CM13? And, please can anyone help me out on this matter?... Thanks in advance...
rudra_666 said:
Hey guys, I've been using CM13 builds on my Nexus 6p for last few months. Generally, i flash new builds after 3/4 days from the last one. Everything's works fine, no big issues; but recently from last months build which ever update i flash on the device, the WiFi seems not working. It shows, it's on - Searching for Networks; but not able to connect or even find any network at all. And i tried to flash back to the older builds of CM13, the WiFi works fine on those builds quite fine. Beside this, I've tried Paranoid Android ROM on this device, WiFi works fine on that rom. So, have any of you faced such problem on CM13? And, please can anyone help me out on this matter?... Thanks in advance...
Click to expand...
Click to collapse
I've been successively flashing the nightlies from 07/24 until today and have had no issues with Wi-Fi. Sounds like yoh crossed over drom June to July build. Flash the July vendor image then re-flash latest cm and you should be good to go. If you use a custom kernel also make sure you are using the latest version made for this month.
blitzkriegger said:
I've been successively flashing the nightlies from 07/24 until today and have had no issues with Wi-Fi. Sounds like yoh crossed over drom June to July build. Flash the July vendor image then re-flash latest cm and you should be good to go. If you use a custom kernel also make sure you are using the latest version made for this month.
Click to expand...
Click to collapse
Thanks a lot, brother. I've just flashed the latest vendor image, and it's working smoothly...
I will start right off the bat that I know it works very well on all ROMS for those that are in India. But can anyone here confirm VoLTE working on any custom Nougat ROM for those like me on T-Mobile in USA? It works flawlessly on 3.5.6, but as soon as I wipe and flash any custom 14.1 ROM, I lose it. The feature is enabled in SIM settings (Enhanced 4G LTE Mode) is enabled, but when I dial out, data switches from LTE to H. So this means even though the feature is enabled, it's not working on Nougat on T-Mobile in US.
Anyone?
M5devil said:
I will start right off the bat that I know it works very well on all ROMS for those that are in India. But can anyone here confirm VoLTE working on any custom Nougat ROM for those like me on T-Mobile in USA? It works flawlessly on 3.5.6, but as soon as I wipe and flash any custom 14.1 ROM, I lose it. The feature is enabled in SIM settings (Enhanced 4G LTE Mode) is enabled, but when I dial out, data switches from LTE to H. So this means even though the feature is enabled, it's not working on Nougat on T-Mobile in US.
Anyone?
Click to expand...
Click to collapse
Did you try clean flashing including system?
First install 3.5.6 and then clean flash any cm 14.1 ROM (especially the latest one from grarak). Volte works fine..
Is your VoLTE capable sim in Slot 1?
magnettron said:
Did you try clean flashing including system?
First install 3.5.6 and then clean flash any cm 14.1 ROM (especially the latest one from grarak). Volte works fine..
Click to expand...
Click to collapse
I've done that several times to no avail. First it was just flashing the 3.5.6 modem firmware while I was on RR 7.1.1. Then after that didn't work, I clean flashed OOS 3.5.6 and tested VoLTE and it worked as advertised with HD logo on calls and VoLTE logo in status bar. I was then happy and clean flashed (everything but internal storage) RR 7.1.1, enabled the Enhanced 4G LTE Mode, but that didn't work. I'm on Official CM 14.1 now with same result.
suraj.das said:
Is your VoLTE capable sim in Slot 1?
Click to expand...
Click to collapse
Yes it's in Slot 1.
Are you guys in US on T-Mobile? No offense to you guys, and I appreciate your help, but I know you got it working great on Jio in India... That might not be the case for us in US. That's why I want to hear from another T-Mobile customer to check if I'm not alone.
Thanks
In mean time I'm forced to stay on OOS 3.5.6 as VoLTE is working great on it.
M5devil said:
I've done that several times to no avail. First it was just flashing the 3.5.6 modem firmware while I was on RR 7.1.1. Then after that didn't work, I clean flashed OOS 3.5.6 and tested VoLTE and it worked as advertised with HD logo on calls and VoLTE logo in status bar. I was then happy and clean flashed (everything but internal storage) RR 7.1.1, enabled the Enhanced 4G LTE Mode, but that didn't work. I'm on Official CM 14.1 now with same result.
Yes it's in Slot 1.
Are you guys in US on T-Mobile? No offense to you guys, and I appreciate your help, but I know you got it working great on Jio in India... That might not be the case for us in US. That's why I want to hear from another T-Mobile customer to check if I'm not alone.
Thanks
Click to expand...
Click to collapse
Yeah I'm having same issue and it was working couple days ago it keeps dropping to H+ after couple days anyone help? It's not my service cause on my 5S I get LTE and it doesn't drop
M5devil said:
I've done that several times to no avail. First it was just flashing the 3.5.6 modem firmware while I was on RR 7.1.1. Then after that didn't work, I clean flashed OOS 3.5.6 and tested VoLTE and it worked as advertised with HD logo on calls and VoLTE logo in status bar. I was then happy and clean flashed (everything but internal storage) RR 7.1.1, enabled the Enhanced 4G LTE Mode, but that didn't work. I'm on Official CM 14.1 now with same result.
Yes it's in Slot 1.
Are you guys in US on T-Mobile? No offense to you guys, and I appreciate your help, but I know you got it working great on Jio in India... That might not be the case for us in US. That's why I want to hear from another T-Mobile customer to check if I'm not alone.
Thanks
Click to expand...
Click to collapse
Official CM 14.1 hasn't implemented Volte function yet, try the unofficial build from Grarak in basketbuild or andriod host.
As far as T-Mobile is concerned, if you do have Volte enabled in 3.5.6 (ie if you can make volte calls using oos 3.5.6, then i dont see a reason why it wont work on cm 14.1 unofficial).
Check out android development for OP2 to get the latest link from grarak.
Also slot 1 or 2 it doesn't matter. If you get Volte in oos 3.5.6 then in unofficial cm 14.1 you'll get it.
Dont know about RR though.
magnettron said:
Official CM 14.1 hasn't implemented Volte function yet, try the unofficial build from Grarak in basketbuild or andriod host.
As far as T-Mobile is concerned, if you do have Volte enabled in 3.5.6 (ie if you can make volte calls using oos 3.5.6, then i dont see a reason why it wont work on cm 14.1 unofficial).
Check out android development for OP2 to get the latest link from grarak.
Also slot 1 or 2 it doesn't matter. If you get Volte in oos 3.5.6 then in unofficial cm 14.1 you'll get it.
Dont know about RR though.
Click to expand...
Click to collapse
Thanks man, I'll check Graham build and report.
M5devil said:
Thanks man, I'll check Graham build and report.
Click to expand...
Click to collapse
Cheers mate, there are 2 different builds one from grarak and one from Seraph08. Try either one, both works fine.
I am using grarak and its stable and latest implementation of lineage.
https://mirror.srvr.gdn/?dir=grarak/oneplus2
or
https://basketbuild.com/devs/Seraph08/oneplus2/LineageOS
magnettron said:
Cheers mate, there are 2 different builds one from grarak and one from Seraph08. Try either one, both works fine.
I am using grarak and its stable and latest implementation of lineage.
https://mirror.srvr.gdn/?dir=grarak/oneplus2
or
https://basketbuild.com/devs/Seraph08/oneplus2/LineageOS
Click to expand...
Click to collapse
Just tried Grarak's latest build based on new LineageOS....still no go on VoLTE. The feature was already enabled under SIM 1 settings and as soon as I dial out LTE switches back to H
I'll try Seraph's build, but I'm afraid it will be the same... Are you on T-Mobile and VoLTE works CM14.1 for you?
Update: tried both builds, VoLTE is not working Again, it's enabled in the SIM settings, but when I dial out, LTE changes to H/H+.
I guess it's just not meant to be... I'll stick to OOS 3.5.6 for now
Thanks for your help!
Was downloading Seraph's build while on Grarak's and got a random reboot which never happened tocme before...
Have you enabled Enhanced 4G LTE Mode for the sim? That's the switch for VoLTE. Hope it worked
If the HD icon comes in the status bar and on notifications, then VoLTE is active.
Also set network type to LTE only for better use.
evilgenius94 said:
Have you enabled Enhanced 4G LTE Mode for the sim? That's the switch for VoLTE. Hope it worked
If the HD icon comes in the status bar and on notifications, then VoLTE is active.
Also set network type to LTE only for better use.
Click to expand...
Click to collapse
The problem is I had it enabled, but HD icon never comes up and VoLTE seems not to work on any CM141. ROM. But it works perfectly well on OOS 3.5.6. So I am not sure why this is the case... I guess I'll stay on OOS 3.5.6, unless another T-Mobile US user will confirm or disagree with my findings.
I know very well you guys have it working on JIO in India... this is not the case for me in USA on T-Mobile
M5devil said:
The problem is I had it enabled, but HD icon never comes up and VoLTE seems not to work on any CM141. ROM. But it works perfectly well on OOS 3.5.6. So I am not sure why this is the case... I guess I'll stay on OOS 3.5.6, unless another T-Mobile US user will confirm or disagree with my findings.
I know very well you guys have it working on JIO in India... this is not the case for me in USA on T-Mobile
Click to expand...
Click to collapse
Also check this under testing (dial *#*#4636#*#*)
evilgenius94 said:
Also check this under testing (dial *#*#4636#*#*)
Click to expand...
Click to collapse
This is what I see.
I guess I have to try this again on a CM14.1 ROM to see what it shows
Last thing u can try up is Clean Flash OOS 3.5.6 again and then clean flash some CM14.1 ROM
Something might work out
evilgenius94 said:
Last thing u can try up is Clean Flash OOS 3.5.6 again and then clean flash some CM14.1 ROM
Something might work out
Click to expand...
Click to collapse
I'll try that again tonight
M5devil said:
Just tried Grarak's latest build based on new LineageOS....still no go on VoLTE. The feature was already enabled under SIM 1 settings and as soon as I dial out LTE switches back to H
I'll try Seraph's build, but I'm afraid it will be the same... Are you on T-Mobile and VoLTE works CM14.1 for you?
Update: tried both builds, VoLTE is not working Again, it's enabled in the SIM settings, but when I dial out, LTE changes to H/H+.
I guess it's just not meant to be... I'll stick to OOS 3.5.6 for now
Thanks for your help!
Was downloading Seraph's build while on Grarak's and got a random reboot which never happened tocme before...
Click to expand...
Click to collapse
I assume that you did a clean flash (including system wipe in TWRP) over 3.5.6. If not the network will be unstable.
In one of the screenshot posted by you (in some above thread) I can see that Volte is enabled, is it on CM or 3.5.6 ?
T-Mobile in US is supported by 3.5.6 (Which I can see from the screenshot). So the firmware got the capability of Volte..
As of now there are 2 possibilities:
1 (If you clean flashed CM over OOS 3.5.6) : Then network is not stable, Network guru app will lock the LTE band, so give it a try with that. (If you need detailed steps with Network guru i can tell you that)
2 (If not clean flashed CM over OOS 3.5.6) : Recommend you to clean flash it. This will definitely work (suggest you to go for grarak). If you face issues after this, do let me know. We can find other work around.
Hope this helps.
magnettron said:
I assume that you did a clean flash (including system wipe in TWRP) over 3.5.6. If not the network will be unstable.
In one of the screenshot posted by you (in some above thread) I can see that Volte is enabled, is it on CM or 3.5.6 ?
T-Mobile in US is supported by 3.5.6 (Which I can see from the screenshot). So the firmware got the capability of Volte..
As of now there are 2 possibilities:
1 (If you clean flashed CM over OOS 3.5.6) : Then network is not stable, Network guru app will lock the LTE band, so give it a try with that. (If you need detailed steps with Network guru i can tell you that)
2 (If not clean flashed CM over OOS 3.5.6) : Recommend you to clean flash it. This will definitely work (suggest you to go for grarak). If you face issues after this, do let me know. We can find other work around.
Hope this helps.
Click to expand...
Click to collapse
Hey man, first of all I wanna thank you for helping me, I know it's an annoying topic for many.
I'll answer in order.
Yes, I did a clean flash, by wiping everything except internal storage. The screenshots I posted are from OOS 3.5.6. By the way, my hybrid TWRP doesn't get overwritten, so at least I don't have a headache reflashing recovery image after everything OOS flash. Unfortunately, it hadn't worked yet... Firmware is definitely VoLTE capable as I have it working very well now on OOS 3.5.6.
As for your suggestions, I tried both builds with clean flash, but they don't work. I kind of gave up after flashing nonstop and just stayed on OOS 3.5.6.
I think you're right though, CM14.1 definitely don't have VoLTE fully functional, at least for T-Mobile users, maybe it has to due with Band 12 (700a) as this is the band used in US for enhanced LTE.
I wanna hear from some other T-Mobile use, but appears there aren't that many...
I've tried Network Guru app when I has network signal drops, but I'm a little confused how to properly use it. I don't have a magic wand button, but through menu I can get to Band locking screen and in LTE section I had everything checked off. I know in US on T-Mobile we use bands 2 (2G), 4 (3G/4G), and new band 12 (enhanced 4G/LTE). When in the past I only locked band 12, I wasn't able to make calls at all as H/H+ were not active.
I will try to see what I have working now with VoLTE enabled on 3.5.6. I do know I'm mostly on band 4 and in some places band 12.
Hope this info helps.
Mikeyy233 said:
Yeah I'm having same issue and it was working couple days ago it keeps dropping to H+ after couple days anyone help? It's not my service cause on my 5S I get LTE and it doesn't drop
Click to expand...
Click to collapse
Are you also on T-Mobile?
Hey guys, so I was on Oxygen OS 3.5.8 before updating and installed 7.1.2 roms (clean install) and both Sim cards have been losing connectivity over and over. Ive tried flashing the modem to 3.5.6 and even 3.1.0 and then doing another clean install but the issue remains. Ive tried multiple 7.1.2 roms and its the same thing, there was no issue before installing the roms. Any help would be appreciated
i am having the same problem, now i have to go back to stock rom.
I hear network drop issue is caused by Google contacts. If true, you could use the AOSP version. You might have to reflash the rom with pico Gapps.
Murbert said:
I hear network drop issue is caused by Google contacts. If true, you could use the AOSP version. You might have to reflash the rom with pico Gapps.
Click to expand...
Click to collapse
Really? Ive never heard of that lol. Thanks Ill try that and update it here
Wow so that did the trick, Installed halogenOS with full gapss (not stock) and no signal drops
But now I only get edge connection for data, no LTE. Any idea how to fix that now?
EDIT: Updated to OOS 3.5.6 firmware and that did the trick! All good now. Thanks Murbert
Some updates
After go back to stock oos 3.5.8, no signal loss but not LTE also, only 3g or H+
Then I reinstall 7.1.2 ROM with gapps nano , so far no problem (never install Google contact)
Another update...
So Sim connection has been good but now wifi connection drops for like 10 seconds every now and then, very annoying.
Any idea on what this might be now?
The global trouble with all nougat firmware
Hi guys. I amn't alone, I met 10-15 users at 4pda with such problem.
We have the bug at all nougat roms by any devs with different trees...
The sleep of death.
Personally I notice it after/during mobile internet using, but I'm not sure. For long time at home(for a week, for example) with WiFi I have no troubles. But if I am anywhere without WiFi and use 3g(don't have LTE in my country), my phone "sleeps" for some times during just one day... It isn't powered off as it's needed 10-15 seconds of button pressing to turn it on at least.
As the ROM and developer has no meaning I guess that here are the errors in the kernel. @fir3walk says that here are many bugs in our nougat tree and perhaps the trouble is involved in last_dmesg... Or some system force stopes, dozes work improperly.
Not many users have this trouble but it exists an a fact. So it would be great to detect an error and try to fix it. Perhaps not in nougat, at least in new Oreo(I haven't tried it yet so no information about this bug there). We have many ROMs, they are updated for some times a week, new roms are rolling out... But the bug stays still.
If someone else has such problem, write here. Perhaps somebody has any ideas and together we will be able to find solution...
So, all the devs who can detect an error, write us... Any tests, information, logs, etc.
P.S. By the way it is impossible to write logs of powering off(deep sleeping) via logcat or another's. If I run the logging I have no "sleepOFdeath".
It is really global trouble so let's try to fix it together.
I'm sorry for your trouble.
Lets start by figuring out which device is in question
I have a 3s prime and never saw this issue.
So do you have a 3s or 3x or 3s prime?
Hello OP, can i ask if you installed that MIUI Ported ROM based in nougat? Because when i installed it (twice) y faced this issue in every rom that i flashed afterwards, then decided to clean-flash miui fastboot rom and the problem was solved.
Maybe that's your problem.
i face it in rr rom but no in dnd rom
Guys did anyone here with the sod, flash global stable/developer in edl mode?
leyD said:
Hello OP, can i ask if you installed that MIUI Ported ROM based in nougat? Because when i installed it (twice) y faced this issue in every rom that i flashed afterwards, then decided to clean-flash miui fastboot rom and the problem was solved.
Maybe that's your problem.
Click to expand...
Click to collapse
Hello. No, I didn't try miui based on nougat.
But other users say that they notice such trouble at miui(7 android) as well.
So it isn't the cause...
Also about my phone:
Redmi 3s, 2/16, 2016030, FPC, aa1 motherboard.
bekcicandrej said:
Guys did anyone here with the sod, flash global stable/developer in edl mode?
Click to expand...
Click to collapse
Will try to flash via miflash, as I faced no problems before this SOD at 7.1.2. Always flashed my phone via twrp.
By the way, guys, my 3s sleeps well on nougat, but it isn't econom in active mod.
For example, I have made a record at our device at 6.0.1 version - 17.5 hours of screen. Nougat isn't so optimized by now... 10-11 as maximum.
Dmytox said:
Will try to flash via miflash, as I faced no problems before this SOD at 7.1.2. Always flashed my phone via twrp.
By the way, guys, my 3s sleeps well on nougat, but it isn't econom in active mod.
For example, I have made a record at our device at 6.0.1 version - 17.5 hours of screen. Nougat isn't so optimized by now... 10-11 as maximum.
Click to expand...
Click to collapse
17.5 h of SOT on what ROM?
Hey guys plzz help Volte had been not working now to every single user of this rom and doesn't working in any rom and some flashed miui official by lfastboo still voLTE not working plzz developers help us we tried everything.If u wanna take a look at miui 9 by nurujjaman pollab
update de firmware and flash miuipro, that works for me.
My phone contacts are merging with other contacts
Hi Guys,
I'm using 3S prime.
My phone contacts are merging with other contacts. I tried to delete some, but I lost some contacts. Please help me on this........
mannequiin said:
update de firmware and flash miuipro, that works for me.
Click to expand...
Click to collapse
Wait what if I flash miui 9 via fastboot it will work right?
Sunny Za said:
Wait what if I flash miui 9 via fastboot it will work right?
Click to expand...
Click to collapse
Exactly flashing Fastboot image solve mostly
Abhijeet Rajgor said:
Exactly flashing Fastboot image solve mostly
Click to expand...
Click to collapse
It it solved my voLTE works now
Having a serious problem.....I'm running pixel experience ROM now but I have a tried nitrogen OS, ressurection remix ROM, Lineage OS 15.1, Viper OS (nougat), Lineage OS 14.1 and many other ROMs. Volte was working fine few days ago but for the past 3-4 days it was not working. I thought it was a problem with the ROM so I changed the ROM but still got the issue. And today I came to know that my device is showing IMS registration: unavailable
Voice-over LTE: not available and some other things
I tried messing with APNs and flashed some volte patches but still got no luck. Then I tried searching on XDA forum and know what I tried every possible method in almost all the threads and still not able to get volte. Tried searching YouTube for IMS registration and tried googling it also but still the problem is there.
Help me out plzzzz....
Allison 1123 said:
Having a serious problem.....I'm running pixel experience ROM now but I have a tried nitrogen OS, ressurection remix ROM, Lineage OS 15.1, Viper OS (nougat), Lineage OS 14.1 and many other ROMs. Volte was working fine few days ago but for the past 3-4 days it was not working. I thought it was a problem with the ROM so I changed the ROM but still got the issue. And today I came to know that my device is showing IMS registration: unavailable
Voice-over LTE: not available and some other things
I tried messing with APNs and flashed some volte patches but still got no luck. Then I tried searching on XDA forum and know what I tried every possible method in almost all the threads and still not able to get volte. Tried searching YouTube for IMS registration and tried googling it also but still the problem is there.
Help me out plzzzz....
Click to expand...
Click to collapse
Faced same problem just flash fastboot rom it will work for sure.
Allison 1123 said:
Having a serious problem.....I'm running pixel experience ROM now but I have a tried nitrogen OS, ressurection remix ROM, Lineage OS 15.1, Viper OS (nougat), Lineage OS 14.1 and many other ROMs. Volte was working fine few days ago but for the past 3-4 days it was not working. I thought it was a problem with the ROM so I changed the ROM but still got the issue. And today I came to know that my device is showing IMS registration: unavailable
Voice-over LTE: not available and some other things
I tried messing with APNs and flashed some volte patches but still got no luck. Then I tried searching on XDA forum and know what I tried every possible method in almost all the threads and still not able to get volte. Tried searching YouTube for IMS registration and tried googling it also but still the problem is there.
Help me out plzzzz....
Click to expand...
Click to collapse
Wait first delete all apns present now create new APN name:ims,APN:ims,APN type:ims that's it save it (it won't show in APN) now create your old APN settings (don't restore to deafult create the old again that's important) save and that's it if it's not rom problem it will bring ur voLTE back
Try restoring EFS in twrp back up
Allison 1123 said:
Having a serious problem.....I'm running pixel experience ROM now but I have a tried nitrogen OS, ressurection remix ROM, Lineage OS 15.1, Viper OS (nougat), Lineage OS 14.1 and many other ROMs. Volte was working fine few days ago but for the past 3-4 days it was not working. I thought it was a problem with the ROM so I changed the ROM but still got the issue. And today I came to know that my device is showing IMS registration: unavailable
Voice-over LTE: not available and some other things
I tried messing with APNs and flashed some volte patches but still got no luck. Then I tried searching on XDA forum and know what I tried every possible method in almost all the threads and still not able to get volte. Tried searching YouTube for IMS registration and tried googling it also but still the problem is there.
Help me out plzzzz....
Click to expand...
Click to collapse
Maybe you need to write IMEI number again?
Does it show there when pressing *#06#* ?
U may try going back to MIUI 9
And then back to your favorite ROM
I did every single step mentioned above. Even my IMEI number is all good. But VOLTE problem reamins the same.
During the first boot...VOLTE was there, and it was working. Even when I Rebooted, it was again there and still working. But when I Power Off the device and then powered it on, VOLTE was gone and I was unable to call.
Rajshe25 said:
I did every single step mentioned above. Even my IMEI number is all good. But VOLTE problem reamins the same.
During the first boot...VOLTE was there, and it was working. Even when I Rebooted, it was again there and still working. But when I Power Off the device and then powered it on, VOLTE was gone and I was unable to call.
Click to expand...
Click to collapse
Yeah u have to flash fastboot it solved mine
Sunny Za said:
Yeah u have to flash fastboot it solved mine
Click to expand...
Click to collapse
I did that too and thrice bt the problem remained unsolved. As I mentioned, it worked during the initial boot of any custom rom, even after rebooting it. Bt when I powered it off and then booted it up, VOLTE was gone.
Rajshe25 said:
I did that too and thrice bt the problem remained unsolved. As I mentioned, it worked during the initial boot of any custom rom, even after rebooting it. Bt when I powered it off and then booted it up, VOLTE was gone.
Click to expand...
Click to collapse
Yeah happens with me to but now m using Xiaomi.eu miui 9 ROM bro use it for some days and flash another ROM voLTE will work fine as it creates a strong bond between firmware and ROM that miui 9 official doesn't and it has more features than it miui 9. So give it a try
Sunny Za said:
Yeah happens with me to but now m using Xiaomi.eu miui 9 ROM bro use it for some days and flash another ROM voLTE will work fine as it creates a strong bond between firmware and ROM that miui 9 official doesn't and it has more features than it miui 9. So give it a try
Click to expand...
Click to collapse
Could u plz provide the link
---------- Post added at 03:31 PM ---------- Previous post was at 03:30 PM ----------
Rajshe25 said:
Could u plz provide the link
Click to expand...
Click to collapse
Will Jio work?
Use this trick:-
Flash any miui rom v8 or v9 & boot into system..
Now go to recovery wipe all except storage.
Now flash any custom rom i suggest lineage 14.1 & boot into system..
Now again go to recovery go to wipe , advance wipe & wipe only system
Now flash any MIUI rom then wipe cache & dalvik
Now reboot...
Volla your volte now works...
I tried 2 times & all time it works....
If it works for u hit thanks..