Database Users

[Q] Firmware downgrade

I wanted to downgrade the firmware on my galaxy S4 I9500 from BMG9 to BMG1 for the battery life because even when I bought a new original battery from samsung still the drain is high but the phone doesn't get hot as before. When I install the older firmware, the phone loses the mobile network signal and doesn't connect even if I choose the network manually so I have to reinstall the BMG9 again for it to work, can anybody help me with this situation? Thanks
Edit:
I found a solution through flashing the MG1 firmware with MG9 modem through odin but will this work as MG1 or the modem is controlling all the battery drainage and cell signal. I also believe that the problem came from a faulty imei??

Galaxy S4 Gt-i9500 network problem

Hi All
i have GT-i9500 international . IMEI were changed to work on Turkish mobile networks.
it was working but after upgrading to 4.4.2 Network register but always : Emergency calls only.
i can call 112 normally .
when i go to mobile networks and search: i find my network : Turkcell. and when i choose it " Registered on network.
but : emergency calls only.
in service mode : IMEI CERTI:Fail
i downgraded to 4.2.2 but the same problem.
when i dial : *#0011# : UMTS: Home(CS+PS)
when i chose back from menu nothing happen.
i tryed all solutions in XDA and Others , tryed all modems. the same problem
i am using the firmware: I9500XXUBMH1_I9500OJVBMH2_I9500XXUBMG9_HOME.tar.md5
i cant install any other rom with Odin. just this.
service mode just stick on first page.
any idea to help please?

none
i cant help ,wait for ohther peolpe

* restore your efs backup
* It's very weird that you can not install other firmware. Remember that you can not do MG9 downgrade modem. Try install Kitkat with pitfile.

I used to root my Samsung S3 phone with different types of custom roms but most of them drained out my S3 bsttery fast. Due to this experience, I'm scared to root my Samsung S4 which is still in it's original rom and already updated to 4.4.2. When I looked at your screen shots, I kept wondering why your android OS was so high. I was thinking perhaps it was due to your phone being rooted? Is it because most custom roms drain battery faster than original roms? My S4's battery lasts much longer than my S3. I can put aside my phone with the wifi on and battery at 100% when I sleep. When I wake up, the battery is around 98%.

i have same problem anyone can help me plz
thanks in advance

any idea please

vbfather said:
any idea please
Click to expand...
Click to collapse
Hi mate,
The problem in the case above is that the phone lost its IMEI , if your case is the same and you do not have a efs backup , you will have to go to a service shop to have it fix , they need a tool like z3x or similar to fix it
http://forum.xda-developers.com/galaxy-s4/help/registered-network-t2810940/page3

thank u,
my IMEI is fine its repaired IMEI "cause here in turkey somehow we have to do that" but as written above i get no network after return it to 4.2.2
any idea?
thanks in advance

[Q] No signal

Hi all,
First of all, I have a Samsung galaxy s4 from Canada specifically from Rogers. I have got it hardware unlocked, rooted and I am on Cyanogenmod 11.
Now to my problem, I am in the Philippines and I would frequently lose signal, if I'm lucky, it would re-aquire the signal but most of the time, my work around is to turn airplane mode on and off and it would connect back to the carrier for maybe a minute and fully lose signal again.
Any help or suggestions would really be appreciated as it is such a pain to airplane mode and off when I'm jamming to my BT speaker
Here's information about my phone:
Model: sgh-1337m
Cyanogenmod version: 11-20150309-nightly-jflte
Android version: 4.4.4
Baseband version : 1337mvluamdj
If i could help you guys, help me with my problem just let me know.
Thanks all for reading.

Signal issues are mostly connected to the modem,
Flash the right modem for your phone/carrier and see if it help

GDReaper said:
Signal issues are mostly connected to the modem,
Flash the right modem for your phone/carrier and see if it help
Click to expand...
Click to collapse
Hey, thanks for the reply!
I'm a little new to this, could you go in depth on how to do so. Or maybe direct me to a few links I could follow? I am not in Canada and this is my only phone, so I don't want a chance to brick it.
Thanks!
Edit: do I need a computer to reflash the modem because that is something I don't have at the moment.

Here is a modem list. It also has a guide on how to flash.
There was another thread that included the latest lollipop modems , but I can't find it anymore.
You will need Odin which means that you require a PC.
Go to sammobile.com and check what version you need for your carrier and country

Low wifi signal

Hello
Recently got a refurbished S4. Actually i can't know the exact model.
In download mode. It says it is the L720T model (sprint). But i can't instally any sprint rom.
I could install int i9505 roms (jfltexx). I tried updating lollipop modem & bootloader but i could only install Sprint modem (Updated from L720VPUGOH1 to L720VPUGOK3)
But the real problem is that I got very poor wifi signal. When near the router,it works. As soon as you walk bit away ,the signal drops significantly.
I'm still wondering wether it's a hardware or software issue. And i'm not sure about which version i got if i wanted to flash stock firmware. How can resolve this ?

Signal Issues: Hardware or Software?

Poor phone signal.
I have reinstalled the latest official firmware, then a custom rom again. The imei matches the original. Any other ideas please?
Do I need to replace the antenna?!
Thanks...

Correct modem and CSC for your network ??

Hello,
I have the same problem, I have the latest ROM for my country and the good CSC (my phone as Lollipop) .
I don't understand why I have this problem, and in my house, when I was under kit-kat 4.4.2 at the same place I have a good signal, but now I have some time no signal or a very poor signal.
If i don't find a way to repair this problem, i think return with kit-kat.

Hi. Let me know if it works!