Can My phone be Baseband Flashed? - General Questions and Answers

Hello Im a noob at all this, i tryed to chnage my phones bassband with one some of the ones hear
http://forum.xda-developers.com/showthread.php?t=1405345
but the ones from bell/roggers all failed,know i cant connect to any network,like my phone dosnt pick up the networks,
I did a restore but same problem, I used Andriod Flasher but it didnt work it kept giving me errors, then i used cwm recovery
to flash the the baseband but it didnt chnage anything, also tried the build.prop file but nothing.
hope someone can help me out..
reason i tried to flash my baseband is becouse my phone is korean and the freq's are diffrent+ hate I the fido network the data speed areto low around 20kbs and i want to switch to a diffrent network like rogers or telus that have lte service
My phone is a Pantech sky vega racer 2 IM-A830L
rooted

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[Q] Ill pay for Help!

plz help me i have emergency calls only for GSM service i've tried everything i can think of....ill pay you if u help fix this problem
JGAGNON10 said:
plz help me i have emergency calls only for GSM service i've tried everything i can think of....ill pay you if u help fix this problem
Click to expand...
Click to collapse
Could be alot off things. A issue with the sim card to not being carrier permited. Could also have being blacklisted by a carrier .
bought a new sim card no dice....also the phone worked prior to this for like a month how would it get black listed....this happened immediatley after i hit gsm only by accident in phone settings
I have a solution!
Edit: I noticed you started at least three separate threads with different bits of information... Not very good forum etiquette.
I haven't spent time to research this, does your MTS SIM card allow 2G roaming on Rogers? Or only 3G?
I can reproduce the problem, I am running CM7 on a 9020A, with the XXKB3 radio, on the Bell/Telus joint HSPA network, which does not have a 2G GSM network.
On the 9020A: toggling 3G back on, then reflashing an appropriate UCKB2 or UCKD1 radio should fix this. (Either through fastboot or with CWM and the appropriate zip radio files.) You can then reflash the 9020T uncapped XXKB1, XXKB3 or XXKD1 radios afterwards if you wish.
Hope the above helped,
Darkshado
ok im on the same model but in manitoba on mts ill try these radios tho thanks for the input ill let u know how it went
well i just tried uckd1 and nothing...about to try uckb2
attempted to write uckb2 but it said failed and i don't wanna try that again i briked a phone like that once.... so still emergency only calls and im on uckd1
ok! we have progress but not all the way there yet...i can now find the MTS network with uckd1 but when i click on it...it says unable to conect at this time....when i hit select automatically it says registered on network. This has not fixxed the problem just yet tho...any other suggestions?
yes my bad about multiple threads....anyone have the unable to connect problem before?

[Q] Reversing Gingerbread Baseband Flash or Correct Baseband for my Provider

Good Morning,
After flashing the Gingerbread Baseband I no longer am able to register on the network for my provider.
The device is from Rogers but unlocked and being used on the Bell network.
After flashing I realized there may be a different baseband for me to use in Canada (just North of Toronto).
I require some help in locating a Gingerbread baseband that would work or provide me with instructions on how to return to the original baseband.
Any help is appreciated!
Thank you kindly,
- Audi2Audi
Did you set the APN manually? You have to do that.
Hello!
APN in Menu|Settings|Wireless & Networks|Mobile Networks|Access Point Names ?
I have set that to: pda.bell.ca
Is there other steps required though?
Thank you for the response!
apn settings is for internet. phone must tower of sim. may be flashing baseband again will soveit because i am tower getting for my country
If you're wanting to go back to stock froyo first you need to visit here to get your original rom... these will also flash the baseband back too
http://forum.xda-developers.com/showthread.php?t=1246678
or here http://forum.xda-developers.com/showthread.php?t=1155874
then you will need to follow this turtorial in order to flash the stock rom back on (go down to second post that one is in English )
http://forum.xda-developers.com/showthread.php?t=1244490
Although it is a possibility that the BB hasn't flashed correctly, might be worth trying it again... might also be worth trying a froyo rom to see if you get a signal then, because if you do you still have the froyo baseband on...
Simplier to flash stock baseband using kdz tutorial in my signature.
Edit:
But i'm not sure if rogers has the same firmware
adixtra said:
Simplier to flash stock baseband using kdz tutorial in my signature.
Edit:
But i'm not sure if rogers has the same firmware
Click to expand...
Click to collapse
Thanks adixtra i always forget about the tutorial of yours
You can flash a .Bin File for Your P920 or P920H.
Ok, now this is getting bizarre hah.
I reflashed the baseband again and everything went normal as it did before.
This time I searched for networks and selected my provider. After about 5 minutes of the device trying to register on the network an error was received that said it was unable to register on this network.
However, when I got to my home screen I was registered on the network. I tested a voice call and it worked. I have tested data as well.
BUT! This is where it gets even more bizarre...The device cycles from 4 signal bars to 2 signal bars to none to 3G (from H) followed by not being registered on the network. Then a few minutes later (sometimes only after a reboot) it returns to 4 bars and begins the cycle again.
Has anyone seen anything like this before?
Thank you again for your help!
Questions or Problems Should Not Be Posted in the Development Forum
Please Post in the Correct Forums and Read THIS
Moving to General
Yes i have seen this with my install of the baseband file but it will not let me register the 3g or 3g+ let keeps me on full with gsm only its why i flashed mine back using the lg update tool software i put it right back to stock using similar way you flashed the baseband file. PS im on rogers as well
teray0n said:
Yes i have seen this with my install of the baseband file but it will not let me register the 3g or 3g+ let keeps me on full with gsm only its why i flashed mine back using the lg update tool software i put it right back to stock using similar way you flashed the baseband file. PS im on rogers as well
Click to expand...
Click to collapse
Good Evening,
Would you be able to upload the KDZ file from your update?
I am having problems with the LG Phone Recovery indicating that I have the most up to date software and halting the recovery process.
Thank you!
- Audi2Audi
Hello,
I flashed an earlier KDZ which allowed me to use the LG Update tool to restore my stock rom.
Thank you everyone for your help and advice.
- Audi2Audi.
it will tell you that but if you use recovery mode and it will download the file then you will have to unplug the phone from usb hold vol+ power then plug it back into the usb and it should download. like i said i used similiar method to flashing baseband
On my windows 7 not detect omap 4 and i can't flash baseband,what can i do?

[Q] Skyrocket no sim ... a posible fix

hi i know there are a lot of threats already of this but now i bring a posible solution to this problem
in my case is no hardware problem cuz i change it, i have falshed a lot of modem and still says no sim... insert sim
btw the phone is unlock. so i decide to leave my skyrocket as nonfuntional phone but i start tu play with the service mode
and suddendly recognize the sim card and get data and works great. but it only works until you reset or power of the phone.
if that happend you have to do my steps again and that way you get sim recognition again.
i post this cuz im not a developer i dont know to much about debuging mode so plp that know that can see my steps a find a permanent solution
to the no sim error on skyrocket.
before start you have to inserte the FUNCTIONAL SIM CARD and power up the phone, it will power with no sim error
un dialer put *#197328640#
enter to debug screen 1
enter to phone control 8
enter to simulation 5
enter to modem Assert (reset)
at this point it appear to dont do anything but wait like 30 seg you will see the signals would restart and then do this
press menu and choose end
there it is now it recognize the sim...... so it possible is something with MODEM ASSERT (reset) but this is a solution not PERMANENT cuz when you reset o turn off the phone you have to do this again to get sim recognition again
so pliz devoleper make a PERMANENT solution with what i found
i try this with an att skyrocket with UCL2 baseband and UCL2 oem root ics
if you guys try this or think it its not possible just post me and on the weekend i ll upload a youtube video with all the steps and you ll see that it works
sorry for my english
Did you back up your efs folder?
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2
efs folder
Mervingio said:
Did you back up your efs folder?
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2
Click to expand...
Click to collapse
i bougth the skyrocket from ebay already with this issue so i dont have a efs folder backup. the phone is sim unlock
i also have another att skyrocket same version can a copy the efs file from it and back up on the defective skyrocket?
4italia4 said:
i bougth the skyrocket from ebay already with this issue so i dont have a efs folder backup. the phone is sim unlock
i also have another att skyrocket same version can a copy the efs file from it and back up on the defective skyrocket?
Click to expand...
Click to collapse
I think that would clone the imei and mac addresses aka bad news.
damn
lart2150 said:
I think that would clone the imei and mac addresses aka bad news.
Click to expand...
Click to collapse
well the defective skyrocket showns the imei and mac and its correct with the back label, i already backed up tha efs folder. i also try tu run the GSII_repair ant it says on step 3 nv_data.bak and his nv_data.bak.m5d is miss so i think that the problem is something with that. As i have the back up of my partial efs folder i think i can start playing around and see what i got cuz in my partial efs folder i have my imei backed up
what do you think?
4italia4 said:
well the defective skyrocket showns the imei and mac and its correct with the back label, i already backed up tha efs folder. i also try tu run the GSII_repair ant it says on step 3 nv_data.bak and his nv_data.bak.m5d is miss so i think that the problem is something with that. As i have the back up of my partial efs folder i think i can start playing around and see what i got cuz in my partial efs folder i have my imei backed up
what do you think?
Click to expand...
Click to collapse
IMO you need back ALL to stock and UNROOT then start from zero and see.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2
Mervingio said:
IMO you need back ALL to stock and UNROOT then start from zero and see.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2
Click to expand...
Click to collapse
i thought he tried going back to stock
note: going back to stock will unroot , its just like getting it new from carrier, then see if your having sim card issues, btw which carrier are u trying to use, att?
mas movil
vincom said:
i thought he tried going back to stock
note: going back to stock will unroot , its just like getting it new from carrier, then see if your having sim card issues, btw which carrier are u trying to use, att?
Click to expand...
Click to collapse
the phone is ulock and in the efs folder have the imei folder and it showns the correct imei i already back up that folder. im trying to use a panamamenian gsm carrier. i got data internet can make calls can do everything but after y make the steps above after turn on the phone everytime
so this weekend i ll try some new stuff go to stock unroot rom try to merge the efs folder of the good one skyrocket without pasting the imei folder and lets si what i got
4italia4 said:
the phone is ulock and in the efs folder have the imei folder and it showns the correct imei i already back up that folder. im trying to use a panamamenian gsm carrier. i got data internet can make calls can do everything but after y make the steps above after turn on the phone everytime
so this weekend i ll try some new stuff go to stock unroot rom try to merge the efs folder of the good one skyrocket without pasting the imei folder and lets si what i got
Click to expand...
Click to collapse
leave the efs folder alone, just try the stock firmware as is to test
I too am having a problem with an AT&T Skyrocket that is rooted. I have been using it without a problem with Straighttalk's AT&T SIM. I decided to switch it to T-Mobile's $30 plan and unlocked the phone. It worked except service was extremely poor so I flashed the SKY ICE 4.2E R5goo.zip and SKY ICE 4.2-17.zip ROM (T-mobile radio). This didn't work any better so I read that I should try a couple different radios. I attempted to flash the Blaze radio since that seems to be the most popular and after rebooting I get the no SIM error. I have reflashed the stock ROM using ODIN (several times) and now neither the T-mobile or ST SIM is recognized.
I found this thread and attempted to go through the procedure but there is no modem assert reset on my menus.
Any help would be a appreciated.
truebeliever71 said:
I too am having a problem with an AT&T Skyrocket that is rooted. I have been using it without a problem with Straighttalk's AT&T SIM. I decided to switch it to T-Mobile's $30 plan and unlocked the phone. It worked except service was extremely poor so I flashed the SKY ICE 4.2E R5goo.zip and SKY ICE 4.2-17.zip ROM (T-mobile radio). This didn't work any better so I read that I should try a couple different radios. I attempted to flash the Blaze radio since that seems to be the most popular and after rebooting I get the no SIM error. I have reflashed the stock ROM using ODIN (several times) and now neither the T-mobile or ST SIM is recognized.
I found this thread and attempted to go through the procedure but there is no modem assert reset on my menus.
Any help would be a appreciated.
Click to expand...
Click to collapse
Did you notice in odin if it flashed files named mdm.bin and amss.bin? That's the radio.
In case you didn't (and didn't read the 1 stop thread), here are som links for radios:
A thread with only t-mobile radios (work on our phone too) and here are all the i727 radios.
Hopefully this will help, but really i'm just guessing, maybe someone else can spread some light on your problem.
I'm guessing (hoping) that for some reason the blaze radio failed to flash and so you got a corrupt radio. Then you flashed stock tar that didn't have modem in it.
lingowistico said:
Did you notice in odin if it flashed files named mdm.bin and amss.bin? That's the radio.
In case you didn't (and didn't read the 1 stop thread), here are som links for radios:
A thread with only t-mobile radios (work on our phone too) and here are all the i727 radios.
Hopefully this will help, but really i'm just guessing, maybe someone else can spread some light on your problem.
I'm guessing (hoping) that for some reason the blaze radio failed to flash and so you got a corrupt radio. Then you flashed stock tar that didn't have modem in it.
Click to expand...
Click to collapse
Yes it did flash the mdm and amss bins. I'm suspecting something happened to the SIM holder since it will not read any of the SIMs (Tmobile, ATT or ST) I tried in it and have another on it's way. I'll see if that changes the outcome.
4italia4 said:
hi i know there are a lot of threats already of this but now i bring a posible solution to this problem
in my case is no hardware problem cuz i change it, i have falshed a lot of modem and still says no sim... insert sim
btw the phone is unlock. so i decide to leave my skyrocket as nonfuntional phone but i start tu play with the service mode
and suddendly recognize the sim card and get data and works great. but it only works until you reset or power of the phone.
if that happend you have to do my steps again and that way you get sim recognition again.
i post this cuz im not a developer i dont know to much about debuging mode so plp that know that can see my steps a find a permanent solution
to the no sim error on skyrocket.
before start you have to inserte the FUNCTIONAL SIM CARD and power up the phone, it will power with no sim error
un dialer put *#197328640#
enter to debug screen 1
enter to phone control 8
enter to simulation 5
enter to modem Assert (reset)
at this point it appear to dont do anything but wait like 30 seg you will see the signals would restart and then do this
press menu and choose end
there it is now it recognize the sim...... so it possible is something with MODEM ASSERT (reset) but this is a solution not PERMANENT cuz when you reset o turn off the phone you have to do this again to get sim recognition again
so pliz devoleper make a PERMANENT solution with what i found
i try this with an att skyrocket with UCL2 baseband and UCL2 oem root ics
if you guys try this or think it its not possible just post me and on the weekend i ll upload a youtube video with all the steps and you ll see that it works
sorry for my english
Click to expand...
Click to collapse
Have you found a permanent solution for this problem? I been having the same issue with a SGH-M919 Tmobile version working on Movistar Colombia.
Thank you.
Very familiar issues buying from ebay garbage
4italia4 said:
hi i know there are a lot of threats already of this but now i bring a posible solution to this problem
in my case is no hardware problem cuz i change it, i have falshed a lot of modem and still says no sim... insert sim
btw the phone is unlock. so i decide to leave my skyrocket as nonfuntional phone but i start tu play with the service mode
and suddendly recognize the sim card and get data and works great. but it only works until you reset or power of the phone.
if that happend you have to do my steps again and that way you get sim recognition again.
i post this cuz im not a developer i dont know to much about debuging mode so plp that know that can see my steps a find a permanent solution
to the no sim error on skyrocket.
before start you have to inserte the FUNCTIONAL SIM CARD and power up the phone, it will power with no sim error
un dialer put *#197328640#
enter to debug screen 1
enter to phone control 8
enter to simulation 5
enter to modem Assert (reset)
at this point it appear to dont do anything but wait like 30 seg you will see the signals would restart and then do this
press menu and choose end
there it is now it recognize the sim...... so it possible is something with MODEM ASSERT (reset) but this is a solution not PERMANENT cuz when you reset o turn off the phone you have to do this again to get sim recognition again
so pliz devoleper make a PERMANENT solution with what i found
i try this with an att skyrocket with UCL2 baseband and UCL2 oem root ics
if you guys try this or think it its not possible just post me and on the weekend i ll upload a youtube video with all the steps and you ll see that it works
sorry for my english
Click to expand...
Click to collapse
Hi, im having the same problem but when i put the numbers *#197328640# it doesn't shoe me anything, empty list, no options!
please i really need any help in this :/
thanks
Not working with your method
4italia4 said:
hi i know there are a lot of threats already of this but now i bring a posible solution to this problem
in my case is no hardware problem cuz i change it, i have falshed a lot of modem and still says no sim... insert sim
btw the phone is unlock. so i decide to leave my skyrocket as nonfuntional phone but i start tu play with the service mode
and suddendly recognize the sim card and get data and works great. but it only works until you reset or power of the phone.
if that happend you have to do my steps again and that way you get sim recognition again.
i post this cuz im not a developer i dont know to much about debuging mode so plp that know that can see my steps a find a permanent solution
to the no sim error on skyrocket.
before start you have to inserte the FUNCTIONAL SIM CARD and power up the phone, it will power with no sim error
un dialer put *#197328640#
enter to debug screen 1
enter to phone control 8
enter to simulation 5
enter to modem Assert (reset)
at this point it appear to dont do anything but wait like 30 seg you will see the signals would restart and then do this
press menu and choose end
there it is now it recognize the sim...... so it possible is something with MODEM ASSERT (reset) but this is a solution not PERMANENT cuz when you reset o turn off the phone you have to do this again to get sim recognition again
so pliz devoleper make a PERMANENT solution with what i found
i try this with an att skyrocket with UCL2 baseband and UCL2 oem root ics
if you guys try this or think it its not possible just post me and on the weekend i ll upload a youtube video with all the steps and you ll see that it works
sorry for my english
Click to expand...
Click to collapse
I didn't find option in Simulation (I have inserted the Working Sim Card). Well I live in Mumbai,India. I can't come to US just to fix this phone. So please tell me what to do now? plz Plz tell me. am eagerly waiting for your reply.
I am finding permanent solution for this problem.
So you will need to solutions for this problem.
Please contact us on 9420076969.
Your phone is still properly working.

[Q] Nexus S XXKB2 Problem

Hy I own a nexus s i2093 and i get strange problems with my phone,first of all i tried to install gingerbread vith odin and my phone simply does not start with gingerbread on it just with the ics but in the ics i get a major problem and that problem is that i get unknown baseband and phone does not have an imei if i flash other radios than xxkb2 my data is not working but with xxkb2 i managed to get work just the bluetooth,wifi isn't turning on at all and my phone simply does not "see" the sim card.Please can anyone help me wit this?I haven't back up my efs folder.Can I restore it with riff box?

[Q] **Not Registered On Network, Galaxy s3 GT-I9300. Help!!

Hi all,
looking for some solid advice on what to do next, My Gt-I9300 is originally from ireland, on the network meteor.
i got it factory unlocked, then i moved to western australia , started using a telstra sim everything worked fine, then when i tried to make a call it would make no sound during call on both phones, (mine and the one im calling) when i hang up i would loose signal and then it would come back after a few seconds, so after doing factory restets ect, nothing worked. i then rooted the phone using odin to see if anything would change with the no sound during calll problem , the rooted file i used was for the telstra network (australia) then when trying to make calls it says not registered on network, went into network settings and manually tried to select the telstra network , still no luck. and now to where im at now , i unrooted my phone using odin the unroot file i downloaded was for the meteor network(ireland) one the phone originally came on . still the same problem with not registered on network. i will admit im familiar with what im doing but not a expert , please help i need my phone :crying:
can someone please help any advice will be appreciated :good:
Hi
First you have to root again, install busybox then install Ariza Patch for IMEI, click on patch 0.5 and you should be fine. I think everyone who has upgraded to leaked JB 4.2.2 ended up in the same situation.
http://forum.xda-developers.com/showthread.php?t=1918601
I hope this helps?
FIX FOUND!!
EgAiddo said:
Hi all,
looking for some solid advice on what to do next, My Gt-I9300 is originally from ireland, on the network meteor.
i got it factory unlocked, then i moved to western australia , started using a telstra sim everything worked fine, then when i tried to make a call it would make no sound during call on both phones, (mine and the one im calling) when i hang up i would loose signal and then it would come back after a few seconds, so after doing factory restets ect, nothing worked. i then rooted the phone using odin to see if anything would change with the no sound during calll problem , the rooted file i used was for the telstra network (australia) then when trying to make calls it says not registered on network, went into network settings and manually tried to select the telstra network , still no luck. and now to where im at now , i unrooted my phone using odin the unroot file i downloaded was for the meteor network(ireland) one the phone originally came on . still the same problem with not registered on network. i will admit im familiar with what im doing but not a expert , please help i need my phone :crying:
Click to expand...
Click to collapse
hey i had the same prob wid my gs3, nd i too tried everything possible ( almost ) including the efs backup blah blah!! backporting blah blah ablosutely nuttin worked!
went to spamsung service center n they said plz replace ur mainboard!! cost about 130$ in india!
neway
luckily today i wanted to checkout the official android 4.3 rom for sg3 and so i flashed it on to my phone using odin nd der we go!!
my imei is no longer 0049***!!!
is back to original nd i can make calls and send/receive txt msgs!!!
link to download and detailed instruction on how to flash is at sammobile.com
i hope it helps you guys! cheers nd thanks everybody for all the help
Finally solved with me by another way
EgAiddo said:
Hi all,
looking for some solid advice on what to do next, My Gt-I9300 is originally from ireland, on the network meteor.
i got it factory unlocked, then i moved to western australia , started using a telstra sim everything worked fine, then when i tried to make a call it would make no sound during call on both phones, (mine and the one im calling) when i hang up i would loose signal and then it would come back after a few seconds, so after doing factory restets ect, nothing worked. i then rooted the phone using odin to see if anything would change with the no sound during calll problem , the rooted file i used was for the telstra network (australia) then when trying to make calls it says not registered on network, went into network settings and manually tried to select the telstra network , still no luck. and now to where im at now , i unrooted my phone using odin the unroot file i downloaded was for the meteor network(ireland) one the phone originally came on . still the same problem with not registered on network. i will admit im familiar with what im doing but not a expert , please help i need my phone :crying:
Click to expand...
Click to collapse
Dear All
This problem come to me many time , without any solved but finally i found the fixer , easy without patch and root
Today , i tray to install the latest android software from same mobile exactly UK Android 4.3 FOR S3 I9300 , THATS BECAUSE I HAVE THIS PROBLEM AGAIN , AFTER I INSTALLED FRWARE ANDRIOD 4.3 UK EVERY THING IS BACK LIKE BEFORE THE IMEI # BACK & THE NETWORK IS BACK .
WITH MY RESPECT
ZOHER:good:
solved
EgAiddo said:
Hi all,
looking for some solid advice on what to do next, My Gt-I9300 is originally from ireland, on the network meteor.
i got it factory unlocked, then i moved to western australia , started using a telstra sim everything worked fine, then when i tried to make a call it would make no sound during call on both phones, (mine and the one im calling) when i hang up i would loose signal and then it would come back after a few seconds, so after doing factory restets ect, nothing worked. i then rooted the phone using odin to see if anything would change with the no sound during calll problem , the rooted file i used was for the telstra network (australia) then when trying to make calls it says not registered on network, went into network settings and manually tried to select the telstra network , still no luck. and now to where im at now , i unrooted my phone using odin the unroot file i downloaded was for the meteor network(ireland) one the phone originally came on . still the same problem with not registered on network. i will admit im familiar with what im doing but not a expert , please help i need my phone :crying:
Click to expand...
Click to collapse
update to 4.2.2
root device
google "ariza_jbv02.zip", put it on root folder and install through CWM
everything will be ok
update
try to update higher android version
EgAiddo said:
Hi all,
looking for some solid advice on what to do next, My Gt-I9300 is originally from ireland, on the network meteor.
i got it factory unlocked, then i moved to western australia , started using a telstra sim everything worked fine, then when i tried to make a call it would make no sound during call on both phones, (mine and the one im calling) when i hang up i would loose signal and then it would come back after a few seconds, so after doing factory restets ect, nothing worked. i then rooted the phone using odin to see if anything would change with the no sound during calll problem , the rooted file i used was for the telstra network (australia) then when trying to make calls it says not registered on network, went into network settings and manually tried to select the telstra network , still no luck. and now to where im at now , i unrooted my phone using odin the unroot file i downloaded was for the meteor network(ireland) one the phone originally came on . still the same problem with not registered on network. i will admit im familiar with what im doing but not a expert , please help i need my phone :crying:
Click to expand...
Click to collapse
I was having a similar issue on my friend's i9300. I upgraded his phone to 4.3 but got this issue. Unfortunately, I didn't back up his EFS so lost the network after upgrade (NOT REGISTERED ON NETWORK).
I Tried everything from Ariza patch to going back to 4.1 MG4 firmware & zuluman patching the MG4 modem but nothing worked at all.
I was at my wit's end when as a last resort I installed I9300XXUGNB6 firmware through Odin. Then rooted it, installed CWM recovery. After that I installed "Patched_Modem_I9300XXEMG4" zip through CWM (ATTACHED).
There was still no network & IMEI turned to 000000000.
After that I downloaded Boeffla 5.1 kernel (for i9300) and VOILA, I got network & IMEI was restored. I do not know how it worked but it solved my problem. You can download Boeffla kernel from his website boeffla-kernel. de
I promised myself to always backup EFS & never to upgrade anyone's phone again except my own. Too much liability.
I hope it works for you.

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