Call dropping or caller does not hear me anymore


steve1712

Members
Dec 5, 2010
53
20
Hi there! I'm out of my country right now and I've not a PC to extract the modem.img..... Could someone extract it and post here or send it to a clue service? Thanks in advance
here you'go:
https://1drv.ms/f/s!AiIZqPOtqD4Xp5t_xbMjGOZvximcAA

you will find the extracted modem.img ( ~162MB) file (just renamed it to make it clear from what miui update package it is..)
you should be able to flash it via twrp (just switch to image flashing in twrp to display it..)

btw the latest china stable (miui_MIMIX2S_V10.3.1.0.PDGCNXM_fd117de242_9.0)
AT4.0.c2.6-301-0319_2103_d9528a4

pps.: i'm curently download xiaomi "offical" 9.4.18 developer rom and xiaomi.eu dev rom... and will check the modem.img files.. and also will upload it to the cloud share...
 
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Solmer

Members
Mar 24, 2019
15
3
here you'go:
https://1drv.ms/f/s!AiIZqPOtqD4Xp5t_xbMjGOZvximcAA


Hi ! Thank you so much!!! I'l try ASAP :)

you will find the extracted modem.img ( ~162MB) file (just renamed it to make it clear from what miui update package it is..)
you should be able to flash it via twrp (just switch to image flashing in twrp to display it..)

btw the latest china stable (miui_MIMIX2S_V10.3.1.0.PDGCNXM_fd117de242_9.0)
AT4.0.c2.6-301-0319_2103_d9528a4

pps.: i'm curently download xiaomi "offical" 9.4.18 developer rom and xiaomi.eu dev rom... and will check the modem.img files.. and also will upload it to the cloud share...


Great !
 

V3n0m

Members
Apr 14, 2019
7
3
Chinese Beta ROM 9.4.18 comes with baseband version AT4.0.c2.6-303-0416_1014_8fadd5d, no LTE issues so far.
For me it's also stable. LTE is working fine. I think I have still some problems with a weak signal but I'm happy to use lte again!
 
Feb 28, 2018
11
13
I always update my phone to latest rom version so i have the same issues with 10.3.1.0 EU stable ROM and have no way to solve this problem. I had to go back to xiaomi.eu rom ver 10.0.7.0 and everything is OK. I will go back to latest version if all isues were fixed.
 

Solmer

Members
Mar 24, 2019
15
3
here you'go:
https://1drv.ms/f/s!AiIZqPOtqD4Xp5t_xbMjGOZvximcAA

you will find the extracted modem.img ( ~162MB) file (just renamed it to make it clear from what miui update package it is..)
you should be able to flash it via twrp (just switch to image flashing in twrp to display it..)

btw the latest china stable (miui_MIMIX2S_V10.3.1.0.PDGCNXM_fd117de242_9.0)
AT4.0.c2.6-301-0319_2103_d9528a4

pps.: i'm curently download xiaomi "offical" 9.4.18 developer rom and xiaomi.eu dev rom... and will check the modem.img files.. and also will upload it to the cloud share...
Hi Steve1712, I've tried the modem.img but it doesn't works for me....I've used it with the weekly 9.4.18...

Which ROM are youe using? No echo problem wiht it?

Thanks in advance.
 

Solmer

Members
Mar 24, 2019
15
3
I had call quality problems all the time and it seems, those instructions are helping me:

/system/build.prop replace those two line :

ro.qc.sdk.audio.fluencetype=none
persist.audio.fluence.voicecall=true

With this:

ro.qc.sdk.audio.fluencetype=fluence
persist.audio.fluence.mode=endfire
persist.audio.handset.mic=digital
persist.audio.voicecall.mic=0
persist.audio.voice.clarity=none
persist.audio.aanc.enable=false
persist.audio.handset_rx_type=DEFAULT
persist.audio.nsenabled=ON
persist.speaker.prot.enable=false
persist.audio.spkcall_2mic=OFF

I have to test it more, but call quality is much better now, there are no echoes and no lost words or speech stuttering anymore.
Maybe xiaomi.eu developers can explain, what all the lines are doing, maybe they can use something from there to put it in the ROM, so we don't need to replace build.prop file every week with new weekly ROM.
Hi it works for me! I hace to put volume two points down but it's enought for making a call. BTW I'm on Stable 10.0.7.0.PDGCNFH
 

dmc84

Members
Apr 23, 2019
6
3

Phurya

Members
Dec 19, 2016
18
15
Well, Im quite a flashaolic, so I'm always trying different roms, and I think these problems don't occur in AOSP roms... Can anyone confirm this? It does look to me, but I cannot assure this 100% ...
 
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Solmer

Members
Mar 24, 2019
15
3
Well, Im quite a flashaolic, so I'm always trying different roms, and I think these problems don't occur in AOSP roms... Can anyone confirm this? It does look to me, but I cannot assure this 100% ...
Hi Phurya, I'ma MIUI fan doesn't like ASOP too much but if AOSP don't have the problem I'll think twice...I need to make a full backup of my working phone and I don't have a OTG right now...Could you try an AOSP ROM and post the results? Do you have echo on all your calls?

Thanks in advance.
 

Lars.B

Members
Feb 16, 2019
33
10
Since I was happy with the 4G/LTE connectivity "performance" of the Chinese Beta ROM 9.4.18 I decided to use the Xiaomi.eu ROM 9.4.18 which I assumed is based on the respective Chinese Beta ROM. Both have the same baseband version, AT4.0.c2.6-303-0416_1014_8fadd5d. However, obviously there is a difference because almost immedately after starting to use Xiaomi.eu ROM 9.4.18 I experienced the same 4G/LTE connectivity issues!

Default preferred network is "GSM/WCDMA/LTE" / "LTE/UMTS auto (PRL)" for the Xiaomi.eu ROM 9.4.18 (finally, no TD-SCDMA!). Phone calls and data connection did not work when connected with a 3G (H, H+) network after losing 4G/LTE network connection ("fall back"?). When "dropping" from 4G/LTE VoLTE to a 3G connection voices become garbled and the connection is terminated at some point. So, no real "SRVCC" (Single Radio Voice Call Continuity) here, also with the Chinese (?) modem.img/baseband version that's being used in the Xiaomi.eu ROM 9.4.18.

I've now changed the preferred network to "LTE/CDMA/UMTS auto (PRL)", since there are neighboring WCDMA cells in addition to the available LTE and GSM cells. However, according to wikipedia UMTS is rather WCDMA-ish, so I am not sure whether this will improve my Mi MIX 2S' connectivity "performance".

Voice quality is very good though, which probably can be related to the VoLTE/HD-Voice standard, when I am connected with 4G/LTE networks.
 

Phurya

Members
Dec 19, 2016
18
15
Hi Phurya, I'ma MIUI fan doesn't like ASOP too much but if AOSP don't have the problem I'll think twice...I need to make a full backup of my working phone and I don't have a OTG right now...Could you try an AOSP ROM and post the results? Do you have echo on all your calls?

Thanks in advance.
Actually I don't have any echo
 
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steve1712

Members
Dec 5, 2010
53
20
So be careful... Echo is one thing... But the bigger issue are really the call drops, loosing signal when switching cell towers....

Gesendet von meinem VOG-L29 mit Tapatalk
 

Phurya

Members
Dec 19, 2016
18
15
So be careful... Echo is one thing... But the bigger issue are really the call drops, loosing signal when switching cell towers....

Gesendet von meinem VOG-L29 mit Tapatalk
Exactly, those are the big and annoying issues. I can confirm AOSP rom I'm using now does not have any of the issues mentioned above, as far as I can see for now, everything works without issues, but I'm still testing. Using latest LOS 16 build, with pico Gapps, and latest Magisk.
 

dmc84

Members
Apr 23, 2019
6
3
I'm also on 9.4.18 now (xiaomi.eu weekly) and testing,
I hope xiaomi will fix problem ASAP or more people will need to replace phone as it's main functionalities are broken :(
 

Phurya

Members
Dec 19, 2016
18
15
I'm also on 9.4.18 now (xiaomi.eu weekly) and testing,
I hope xiaomi will fix problem ASAP or more people will need to replace phone as it's main functionalities are broken :(
I was on that on that build too, and the issues are present, my phone gets unusable because although I have network available, people call me,I'm unreachable... When making or receiving a call, signal drops and disconnects short after. With AOSP rom I have zero issues, phone works perfect. Shame on Xiaomi, shame on MIUI.
 

dmc84

Members
Apr 23, 2019
6
3
I hope sooner or later some developer will be able to inspect and increase SAR ratings if this is the source of problems. I don't care if any value is too high or not, but I need phone that is accessible and data and voice are working.
9.4.18 so far looks much better than global stable (that one acted like it has damaged antenna). I'm still testing and I agree - that is shame for xiaomi that they allowed to kill main feature of their flagship device.
Phurya: what is Your country? What baseband version You have in aosp?
 

Phurya

Members
Dec 19, 2016
18
15
I hope sooner or later some developer will be able to inspect and increase SAR ratings if this is the source of problems. I don't care if any value is too high or not, but I need phone that is accessible and data and voice are working.
9.4.18 so far looks much better than global stable (that one acted like it has damaged antenna). I'm still testing and I agree - that is shame for xiaomi that they allowed to kill main feature of their flagship device.
Phurya: what is Your country? What baseband version You have in aosp?
I'm on Portugal right now, I live here, but travel a lot because I'm a industrial solderer, 2 weeks ago I was on Turkey, and same problem, same issues.
Screenshot_20190424-134125_Defini��es.png
 

Solmer

Members
Mar 24, 2019
15
3
Hi! Finally I've a ROM that works like a charm, Miroom, currently using the stable 10.2, everything working, no call drops, no echo! I'm gonna use it until new release. BTW, no Spanish translation but has English language.

portal.mi-room.ru
 

dmc84

Members
Apr 23, 2019
6
3
10.2 was terrible for me, no echo and no call drops, but often people said they have troubles to hear me, often I had messages that someone tried to call me and I was not accessible, later I found out that indeed I can't call myself from other phone. Data connections were poor. Maybe this can work in other countries, but here in Poland it was unusable :(
Now I'm on latest weekly.eu ROM, it's much better - people can hear me and I'm rather online, but I still have some issues regarding quality - one call was dropped, once I could hear every second sentence. Still it's just faulty but seems to be better than that from stable. I still hope they will fix that!

Phurya: I expect that it may work better in different countries, some carriers support different technologies. I never had issues you described like echo, but I had other problems. BTW: is VoLTE working on your side?
 

Phurya

Members
Dec 19, 2016
18
15
10.2 was terrible for me, no echo and no call drops, but often people said they have troubles to hear me, often I had messages that someone tried to call me and I was not accessible, later I found out that indeed I can't call myself from other phone. Data connections were poor. Maybe this can work in other countries, but here in Poland it was unusable :(
Now I'm on latest weekly.eu ROM, it's much better - people can hear me and I'm rather online, but I still have some issues regarding quality - one call was dropped, once I could hear every second sentence. Still it's just faulty but seems to be better than that from stable. I still hope they will fix that!

Phurya: I expect that it may work better in different countries, some carriers support different technologies. I never had issues you described like echo, but I had other problems. BTW: is VoLTE working on your side?
I had no echo problems, but a lot of call dropping, and frequently not being reachable... latest weekly is just the same for me, so I'm using LOS 16, works flawlessly.
It's unacceptable Xiaomi has oficiall builds that makes their phones nearly unusable.
 

steve1712

Members
Dec 5, 2010
53
20
here you'go:
https://1drv.ms/f/s!AiIZqPOtqD4Xp5t_xbMjGOZvximcAA

you will find the extracted modem.img ( ~162MB) file (just renamed it to make it clear from what miui update package it is..)
you should be able to flash it via twrp (just switch to image flashing in twrp to display it..)

btw the latest china stable (miui_MIMIX2S_V10.3.1.0.PDGCNXM_fd117de242_9.0)
AT4.0.c2.6-301-0319_2103_d9528a4

pps.: i'm curently download xiaomi "offical" 9.4.18 developer rom and xiaomi.eu dev rom... and will check the modem.img files.. and also will upload it to the cloud share...
hey there... i've tested some time now.. and can't confirm that the china stable modem firmware is working, at least in global stable rom... still call drops when switching cell phone towers... :(

so baseband: AT4.0.c2.6-301-0319_2103_d9528a4 is no good...

i'm testing baseband from chine dev rom now... (AT4.0.c2.6-303-0416_1014_8fadd5d )
i've uploaded the modem firmware also to the onedrive share if someone else looking for it without downloading and extracting the whole rom..

the next would be to test the modem firmware before the SAR Limit change.. can someone point me to the a rom before the change??
 

Lars.B

Members
Feb 16, 2019
33
10
[...] i'm testing baseband from chine dev rom now... (AT4.0.c2.6-303-0416_1014_8fadd5d ) [...]
Good luck, let us know how it turns out for you. I've had good results with this baseband at first with the Chinese BETA ROM 9.4.18. The xiaomi.eu ROM 9.4.18 has the same baseband version, yet I now have the same or at least similar problems as before ... I am not quite sure by now what else might negatively impact my Mi MIX 2S' connectivity capabilities and performance.
 
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Lars.B

Members
Feb 16, 2019
33
10
I am using xiaomi.eu ROM 9.4.26 on my Mi MIX 2S (8/256 GB XA model, bootloader unlocked). I"ve uploaded zipped modem logs and screenshots of two separate 'loss of 4G/LTE functionality' situations that I have experienced today. Both phone/VoLTE and data service were affected and not available.

Download link (Microsoft OneDrive).