Develop Bugs

CM13 - Signal loss in LTE

Hello,
I have an Oppo Find 7a with CM13. In my home i have 50/75% signal and it goes down to 25% or even 0 during calls. Also, people said they got "busy" when they called me, although I wasn't speaking with anyone at that time. On the streets I usually have signal but during calls it goes down to 50%, causing distortions.
This signal problem appeared 1 week ago, when i upgraded from CM12.
The problem is only in LTE/GSM auto (PRL) (default) mode. In GSM only it works perfectly, but the internet is 3G. Also on each phone restart it gets back to LTE/GSM auto (PRL)
I already changed a few CM13 versions and did clean install, reinstall TWRP and SuperSU.
Please help me fix it. If possible, give me some details or send me to specific guides.
Here are the phone details:
TWRP version: 2.8.4.0
SuperSU: 2.65-20151226141550
Androidversion: 6.0.1
cm-13.0-20160304-NIGHTLY now, I have tried 0302 and 0228 as well.
CyanogenMod API level: Elderberry (5)
Baseband version: .4.0.1.c7-00004-M8974AAAAANAZM-1
Kernel version: 3.4.110-cyanogenmod-g229aab7
Build number: cm_find7-userdebug 6.0.1 MMB29U 8fa5a5536e test-keys
The operator, Vodafone, has only 3G voice services; LTE is for internet only.
Signal strenght right now:
GSM only: -79 dBm 17 asu
LTE/GSM auto (PRL): -109 dBm 31 asu

nothing?

rhade87 said:
nothing?
Click to expand...
Click to collapse
This device fourm is fully inactive bro . Your issues fixed now?

LS980 Signal patches!

So i found these patches on my PC. They are signal patches for roms like Cloudy or IceX. Hoping someone can test and benefit from them.
Signal patch by Siggey:
https://mega.nz/#!r5RTxK5Y!9ct52Y4s5yk2TDE0iDN5-PxtCe2InsGTX9U5ZbN5W_g
Signal patch for all variants?
https://mega.nz/#!TsB1mTqL!My0-FqX0dsrhCsdCEPxwSzxjrcQBo6jkYaoO4jpqKpM
Try at your own risk!

droiduser#3 said:
So i found these patches on my PC. They are signal patches for roms like Cloudy or IceX. Hoping someone can test and benefit from them.
Signal patch by Siggey:
https://mega.nz/#!r5RTxK5Y!9ct52Y4s5yk2TDE0iDN5-PxtCe2InsGTX9U5ZbN5W_g
Signal patch for all variants?
https://mega.nz/#!TsB1mTqL!My0-FqX0dsrhCsdCEPxwSzxjrcQBo6jkYaoO4jpqKpM
Try at your own risk!
Click to expand...
Click to collapse
Ive found theres a bug where data does indeed work but it doesn't show in statusbar and you need an app to activate data.

Ls980 ICCID and IMSI fixed ?

Signal drop!!

OP Senior Member303 posts Thanks: 91
while on custom roms after 10-15 minutes of booting up the signaofl sim1l drops and hd(volte) icon is gone but on the ui it shows full signal and when i open settings there is no option to search signals can'tuse volte and stuff had to reboot and same problem occurs after 10-15 minutes
while on stock/stock based roms the signal or sim2 drops and in ui its also shown and it come back after a while
treid nougat roms , freedom os , stock , sultan cm13 , custom kernels still same problem occurs tried using different firmware , and also tried to restore efs of stock based rom on custom roms but it broke the dialer i.e call doesn't connects
please help me can't use nougat as daily driver
sorry for my bad English

well i have the same problem. but with newer firmwares it shows improvments and it seems the problem is with some operators too.

signal reception better in beta nougat rom
i have the same issue with with cm 14 but not in op3 nougat beta rom

I had the same issue in every cm14 build, but haven't seen a single drop since switching to oxygen beta 8.

I too am using beta 8 no problems.

network Problem

Hello guys,
Today my mi mix 2 arrived. I have some Problems with my network. I can't call and write SMS. I connected to my Provider but IT doesnt work. Have somebody a solution?
Thanks

Have you tried a different SIM card slot?

Did you check the apn settings for data and the service center number for sms? If these are not being read from your SIM card you have to enter them manually.

Change your preferred connection to 3G from LTE should fix the problem. I'm guessing you're on the China ROM. China ROM has issue (maybe bug) with LTE B7 not being properly supported. Flashing Global ROM could or probably will fix the issue.

Hakim Farouk said:
Change your preferred connection to 3G from LTE should fix the problem. I'm guessing you're on the China ROM. China ROM has issue (maybe bug) with LTE B7 not being properly supported. Flashing Global ROM could or probably will fix the issue.
Click to expand...
Click to collapse
Thanks it works.
Yes i am on china rom. I will flash the Global rom in the next time. Do you have a link?

Explains why my lte sucks. Waiting the 3 days still for the bootloader unlock.

Targosch said:
Thanks it works.
Yes i am on china rom. I will flash the Global rom in the next time. Do you have a link?
Click to expand...
Click to collapse
MIUI 8 Global Stable: http://en.miui.com/thread-932832-1-1.html
MIUI 9 Beta: http://en.miui.com/thread-1026126-1-1.html

You need to use MIUI 9. MIUI 8 has an issue connecting to WCDMA networks on this phone. It's ridiculous, but upgrading to MIUI 9 solves it.

duraaraa said:
You need to use MIUI 9. MIUI 8 has an issue connecting to WCDMA networks on this phone. It's ridiculous, but upgrading to MIUI 9 solves it.
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Click to collapse
I solved the problem. I dial *#*#4636#*#* then I went to phone Information and preferred a another network. The standard is lte/td-scdm/WCDMA and I need for Germany LTE/td-scdm/GSM.
In a city it could work with the standard one. But I am living in a village. We don't have lte just GSM

Targosch said:
I solved the problem. I dial *#*#4636#*#* then I went to phone Information and preferred a another network. The standard is lte/td-scdm/WCDMA and I need for Germany LTE/td-scdm/GSM.
In a city it could work with the standard one. But I am living in a village. We don't have lte just GSM
Click to expand...
Click to collapse
But that dial method won't stick though. You will have to do that everytime you reboot your phone. but since you don't have LTE in the countryside, I guess the 3G preferred method in the settings will do for now. You still have to go to the Global ROM to get the LTE bands fully working.

Hakim Farouk said:
But that dial method won't stick though. You will have to do that everytime you reboot your phone. but since you don't have LTE in the countryside, I guess the 3G preferred method in the settings will do for now. You still have to go to the Global ROM to get the LTE bands fully working.
Click to expand...
Click to collapse
I can't just prefer 3G cause I am most of the day in the city

Upgrading to MIUI 9 Global doesn't help. Issue stays. And indeed after every reboot or even flight mode, you must readjust manually.... Terrible issue.

Best Combo for JIO VoLTE

I've just switched from IDEA to JIO last week, and I've been having trouble to get the volte working. It has been working in patches but it's really not a pleasant experience at all. VoLTE icon shows all the time in the notification bar, but it's actually not working all the time. I'd like to ask you all what is the best combination of baseband + ROM for JIO volte to work seamlessly.
FYI: I was on Indian ZUI 2.5 baseband earlier, then I flashed the following baseband https://forum.xda-developers.com/le...oreo-firmwarebaseband-twrp-flashable-t3776254
but the problem remains. I've tried this baseband with almost all major PIE ROM's but nothing seems to work.