Develop Bugs

Flashed new ROMs, now have sporadic 3G data

I accidentally flashed an odexed hotspot hack on a deodexed ROM and in the process lost my TWRP recovery. So I got help from here (thanks, droid716... thread here) and got it working again.
So I've installed several ROMs since then, but can't get consistent 3G again.
Current configuration:
* MOAR v9.0.1
* MK5 modem
* Philz Recovery
I get 3G *most* of the time, but not in the main location I need it. It was fine before.
When installing a new ROM via Philz, I choose "Clean to Install a New ROM" and nothing else.
I have an external SD card in the phone.
I can "Update Profile" and "Update PRL" about half the time when not on WiFi. The 3G/4G icon comes on during the update. Approximately 10% of the time this fixes 3G. Sometimes rebooting helps. Most of the time, if I'm in a "bad location", it doesn't help.
1) What is the proper way to flash a radio? Is it as simple as flashing the radio from recovery with no wipe, etc.?
2) Why does the 3G/4G icon come up when "Update Profile" or "Update PRL" is running? How can they "work" and I still have no 3G?
3) I see another thread (here that suggests that this may be an APN problem. I didn't think my phone had a SIM card. I don't know how to check, update, or fix my APN. Can anyone help (if that is the problem)?
(Note: this is on a Galaxy S3 that has been modified via alpineman's procedures)

Update: re-flashing the MK3 modem again over itself fixed it at least once... any ideas why?

[Q] Network issues after installing DN3 rom

Heya,
So this week I had some issues with my efs partition (phone got boot stuck). Took me a while but managed to solve it by creating a new partition with some commands I found in a guide.
After that I installed a custom rom (DN3) and phone turned on (!!! big success so far).
What I noticed is that my phone allows me to call only emergency numbers. Wifi works fine.
An exact description of what happens:
* When I set to automatic network search - it shows the network bars but without the H sign with arrows indicating it sends/receives data
* When I go to manual and click on my mobile carrier (Pelephone) it immediately says "Registered on network" - and after that still no H with arrows, and I get a network message saying "No Service. Selected network (Pelephone) not available"
* Internet or sms/phone calls not working in any of the choices.
Here is what I have tried so far:
1) Switching properties in mobile network to 2g/3g and automatic network search / manual network search
2) I tried adding APN
3) Installed different rom (Omega V29)
4) Installed 4.3 rom (DN3 version 3.2) - still didn't work. then installed modem (MJ9) and dMK4kernel as described in this guide
5) I tried installed the stock firmware (downloaded from Sammobile)
6) Tried installing XXDME4 Modem
7) I tried of course inserting current sim to different phone and other working sim to this phone - so the problem is not with the sim.
8) Made EFS backup and restored it - not sure why this should work as it seems my EFS is corrupted somehow, but tried it anyway
I am currently using DN3 v5.2 rom
I have CWM recovery
I made EFS backup (though after problem started - as my phone had more serious problems before)
I am rooted
My imei is reading 0049 - i saw in some posts that it means something is corrupted...
I tried searching for threads in here and on other sites, only thing I haven't tried yet is changing imei and I understand thats illegal in some countries + in XDA-Developers, plus it can be very risky - so please any help besides that would be appreciated.
Please help... No idea what to do now. If you want me to download something please provide the link
Thanks!

Have you taken efs backup before installing the rom? If yes then restore it. Google for how to restore efs backup.
Sent from my GT-N7100 using xda premium

No, don't have efs backup from before as didn't have any means of making it

Anyone?

APN won't stick

I have unlocked s6 and APN won't stick. When put into network mode automatic I get to input APN and it works until I let phone turn off screen or I manually hit power button. When I get back into phone the APN setting I input, for t-mobile, are gone. There are Sprint APN listed but I can't choose nor add or delete any. If I choose LTE GSM auto prl through one of the service menu's I am able to again choose APN and input what I want but at sleep and rewake the phone goes back to not listing the APN and having greyed out sprint APN. Phone works but have data issues here and there and sometimes have to reboot to get lte to stick. Lock screen sometimes shows T-mobile as carrier but usually shows Sprint. I can still make calls and use LTE data on my t-mobile sim when it says Sprint as carrier but I think my data and mms issues would be fixed if I could get the dang APN to stick. Any ideas? Different rom? I'm on 5.1.1 OJ7

littlebeeper said:
I have unlocked s6 and APN won't stick. When put into network mode automatic I get to input APN and it works until I let phone turn off screen or I manually hit power button. When I get back into phone the APN setting I input, for t-mobile, are gone. There are Sprint APN listed but I can't choose nor add or delete any. If I choose LTE GSM auto prl through one of the service menu's I am able to again choose APN and input what I want but at sleep and rewake the phone goes back to not listing the APN and having greyed out sprint APN. Phone works but have data issues here and there and sometimes have to reboot to get lte to stick. Lock screen sometimes shows T-mobile as carrier but usually shows Sprint. I can still make calls and use LTE data on my t-mobile sim when it says Sprint as carrier but I think my data and mms issues would be fixed if I could get the dang APN to stick. Any ideas? Different rom? I'm on 5.1.1 OJ7
Click to expand...
Click to collapse
This is a really old thread, but since I've been struggling with this issue for several months, I think this is the place for a reply.
There are several problems with a "sprint" unlocked S6, but the most annoying (other than hands free activation) is the APN settings going back to default and being "locked" until you reboot the phone. When in this "locked" state - you will not be able to receive MMS messages.
I have found that deleting (or simply renaming) the customer.xml (/system/csc/customer.xml) stops the resetting of the APN - and interestingly opens up the additional configurations under Mobile Networks -> Network Mode to choose GSM/WCDMA/LTE.
After fixing this and fixing hands free activation (https://forum.xda-developers.com/sprint-galaxy-s6/help/hands-free-activation-t3199214) the phone now performs VERY well on T-Mobile, just like it belongs there

I just checked my device on 7.0 Nougat and I can't find that file (there is no folder in root>system called "csc"). Any idea how I can fix this?

Bageland2000 said:
I just checked my device on 7.0 Nougat and I can't find that file (there is no folder in root>system called "csc"). Any idea how I can fix this?
Click to expand...
Click to collapse
You may not be allowed to view certain system files for some reason. I believe you have to be rooted to delete them. You could also try the system update first if you are stock. But probably best bet either way would be to start with clean install of whatever ROM you use or the stock ROM from TWRP. I've been able to delete the files from skyhigh and Rick Wardenberg's ROM. GL!:good:
---------- Post added at 12:06 PM ---------- Previous post was at 12:04 PM ----------
Bageland2000 said:
I just checked my device on 7.0 Nougat and I can't find that file (there is no folder in root>system called "csc"). Any idea how I can fix this?
Click to expand...
Click to collapse
You may not be allowed to view certain system files for some reason. I believe you have to be rooted to delete them. You could also try the system update first if you are stock. But probably best bet either way would be to start with clean install of whatever ROM you use or the stock ROM from TWRP. I've been able to delete the files from skyhigh and Rick Wardenberg's ROM. GL!:good:
Edit: I recommend es root explorer to do the dirty work.

if it's not too late
First you need your msl code I can help if not.then use data daily code or an app idonee don't get a fake I found on code after you do that you just need to change mms and apn setting see screenshot.i have 920p on 7.0 stock rooted running on t-mobile lte get mms everything

Signals gone after Marshmallow OTA Update. How to restore back to Lollipop?

I took the MM OTA and now the signal is gone. I cannot make any calls or sms. I live in Pakistan.
Can I flash a lollipop stock rom via odin? I have heard many times that sometimes downgrading isn't possible due to some changes e.g in kernel etc.
Is there some issue like this on Marshmallow update or can I downright flash the old stock ROM via odin?
________
EDIT: I went into Settings > mobile networks > data roaming > and ticked all toggles, then went further into Data roaming > Roaming Guard and ticked all toggles there as well. Then I changed network mode to Automatic. It asked me to reboot and when I did, I got the signals
So the problem is resolved, but I am leaving the question open, for someone else might be needing this.
________

when i update MM by OTA and odin, the signals had gone. I don't see data roaming in mobile networks or setting by search. Please give me some photos. Or add my fb https://www.facebook.com/vietanhnb1993

vietanh_nb_1993 said:
when i update MM by OTA and odin, the signals had gone. I don't see data roaming in mobile networks or setting by search. Please give me some photos. Or add my fb https://www.facebook.com/vietanhnb1993
Click to expand...
Click to collapse
Did you try remove and re-add SIM card and reboot device?

Flash OL1 with Odin, Than UNIKERNEL 8, Than TWRP 3.0

sprint note edge here
usman farhat said:
I took the MM OTA and now the signal is gone. I cannot make any calls or sms. I live in Pakistan.
Can I flash a lollipop stock rom via odin? I have heard many times that sometimes downgrading isn't possible due to some changes e.g in kernel etc.
Is there some issue like this on Marshmallow update or can I downright flash the old stock ROM via odin?
________
EDIT: I went into Settings > mobile networks > data roaming > and ticked all toggles, then went further into Data roaming > Roaming Guard and ticked all toggles there as well. Then I changed network mode to Automatic. It asked me to reboot and when I did, I got the signals
So the problem is resolved, but I am leaving the question open, for someone else might be needing this.
________
Click to expand...
Click to collapse
same happened on my phone. but unlike you i cant find "data roaming" option in "more networks" or anywhere flashed using odin
UPDATE: factory reset solved hat issue hehe

Osaab said:
same happened on my phone. but unlike you i cant find "data roaming" option in "more networks" or anywhere flashed using odin
UPDATE: factory reset solved hat issue hehe
Click to expand...
Click to collapse
i have the same problem no data roaming g920p please anyone help me

I cant find data roaming even after a factory reset.
Help me please
Stock MM 6.0.1 device not rooted

warrenbey said:
I cant find data roaming even after a factory reset.
Help me please
Stock MM 6.0.1 device not rooted
Click to expand...
Click to collapse
Try using this method it works on MM..u can get the signals back
http://forum.xda-developers.com/spr...de-success-sim-unlock-sprint-samsung-t3130294

is it paid ?

Cant choose Network after upgrading to MM

Hi,
I've upgraded my note 4 to MM using the "Bootloader unlock and safe upgrade to MM "post from the general section. Now I'm having the next problems:
1.-I'm using a GSM Sim Card and it works but when I try to change the network mode I only get LTE/CDMA and CDMA, if I select one of those the networks, it stops working, and to go back I have to do a Network Settings Reset.
2.-I cant use MMI codes from my operator, I think that this might be due to the first problem.
What can I do to fix this?

Flash jasmine rom instead
Sent from my SM-N910V using Tapatalk

tribalb said:
Flash jasmine rom instead
Sent from my SM-N910V using Tapatalk
Click to expand...
Click to collapse
Is this the only solution? install another ROM?

Same problem on 5.1.1. Non VZ SIM, two phones (both VZ Note 4's) - the 'Global' network mode option disappears, as does the entire 'APN' button. Restoring to full 5.1.1 (non rooted, etc) resolves this. It appears that during the original setup wizard stage, something (Knox? License Agent? Dunno?) does something and then I can use my non-VZ SIM.
The same thing during a rooted/partial-system-5.1.1 (systemonlyN910V-5.1.1.tar) + factory reset, there is a 'Knox has stopped responding' and the SIM never seems to work, and the network mode options do not allow me to select Global, or input an APN (there is no APN button).
Same thing but *without* wiping "data" (ie, not selecting 'factory reset'), the SIM works, or rather I can select 'Global' as my network mode, and the APN options are available.
Unfortunately I also have to go thru the process of removing KingRoot and the other junk at this point.
My theory at this morning is that there is a setting on 'data' that Knox applies during the setup wizard(s) that affects how the network options work with a non-vz SIM.
I suspect that if you have a normal VZ SIM and go thru the root process above, you probably have limited (fixed) network options but they are the settings that work with vz.
Some or all of the above may be totally wrong - I'm learning daily and have lots of learning left to do.