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Captivate doesn't get any signal

Hi Guys, so here's the thing, i just installed a new ICS rom in my Captivate(i897), but apparently it installed a new Radio/Modem, so when i turn it on, there is no signal at all.
Now i suppose that i need to found a Radio/Modem that works in my country, but i've tried a few from here , where it says I897-ICS/CM7-9/MIUI Modems, and there's no solution.
My country uses 850mhz, hope that someone can help me..
By the way, before installing the ICS I made a backup, but when i restore, it doesn't work either, maybe it doesnt back up the Radio/Modem

You're correct about the restore, it doesn't restore a modem. You need to find a default 850 MHz modem on that website and look for a modem that is listed on this list as default 850 MHz band. Hope you get it working!

My question is this.. That list that you give me, they're all for i9000, but my Captivate is i897, is there any difference?

If you're on an ICS or CM7/MIUI ROM then you have to use an I9000 modem for it work...

Ok, i've tried almost all of the 850mhz modems from the list that you gave me, and still nothing.. what else can it be?, i'm using CM9 ICS

What bands do your carrier use, not the country...

850.. BEFORE installing the ROM it was working perfectly.. there is no way to recover the factory Radio/Modem?
This is the ROM that messed up my radio http://forum.xda-developers.com/showthread.php?t=1362092, now i'm seeing the common issues, and the radio problem is in it. Here is what it says:
Try flashing another modem. If this fails, make sure you have the correct APN settings; and as well that your EFS partition is in working order (check your IMEI number). Big thanks to Oxicottin for the modems!
Click to expand...
Click to collapse
How do I check that EFS partition?

Back to basics first. Was the USB cable plugged in to power or computer when you flashed?? If so the only cure is a reflash of the ROM.

robm1911 said:
Back to basics first. Was the USB cable plugged in to power or computer when you flashed?? If so the only cure is a reflash of the ROM.
Click to expand...
Click to collapse
I don't remember.. probably it was, let suppose it was, so i need to reinstall the rom that inicially screw this up?, and then what?

If the USB was plugged in during initial flash then there's no other option than to reflash the ROM. After that you should be good to go.
Good luck!!

[SOLVED]
I tried reinstalling that ROM, still nothing, now what I did was using Odin and reinstalling a stock rom.., now i have full signal..
Thanks for the help!

I'm surprised checking to see if your imei was wiped or your apn settings has been brought up.

mbc663 said:
I'm surprised checking to see if your imei was wiped or your apn settings has been brought up.
Click to expand...
Click to collapse
Nope, everything seems to be exactly like it was before the issue.
Here's what i've done.
1. http://forum.xda-developers.com/showthread.php?t=731989
2. Download the stock rom in the post, and followed the steps to put the phone in download mode.

Type *#*#2263#*#* in the dialer
Select [2] WCDMA Band
Select [5] WCDMA 850
Press menu-back button and insure that there is only a star next to the wcdma menu. You should be okay from here but a reboot would be a good idea.
Sent from my SGH-I897 using XDA

Btw, flashing a rom plugged in is fine in most cases, I do it all the time. However flashing a modem more specifically, requires you to unplug the USB cable. Unplug to be safe anyways, or make sure you know if the rom is installing new modems with it.
Sent from my SGH-I897 using XDA

No 4G at all

I have an s3 that I flashed to CM10, AOKP 6 and I also tried synergy. I cannot seem to get LTE on the first 2 adn with synergy, I can only get it by using the phone info thing and switching to an LTE ONLY mode. I noticed when I was stock I didnt see it going to LTE either. is this a problem with it switching over or what? When I try to switch to the LTE ONLY mode on the other 2 roms, I get no connection at all.
Any ideas? Is the phone toast? I am an experienced flasher, as I am coming from a galaxy nexus lte and am a crack flasher. Before each rom, I wiped data, cache, dalvik and system.
anyone have ideas? I am at a loss.
thanks
edit: I also noticed that on CM10 and AOKP the activation fails, and I can skip it. My phone number shows up as unknown but I have an IMEI number

*#*#4636#*#*
Change to CDMA/LTE Auto

I did that and I noticed no change. I only have 3g

SAME THNG!!
I have the same problem and can't seem to find a solution!!!!
I have two s3 and they both do the same thing!!!
dougmod said:
i did that and i noticed no change. I only have 3g
Click to expand...
Click to collapse

e-zzy1 said:
I have the same problem and can't seem to find a solution!!!!
I have two s3 and they both do the same thing!!!
Click to expand...
Click to collapse
i had to get a new sim card. i went to the store and the new sim fixed it all

dougmod said:
i had to get a new sim card. i went to the store and the new sim fixed it all
Click to expand...
Click to collapse
I'm having the same problem, I think. When I switch to an LTE option in phone info, it doesn't stay that option. it goes back to CDMA auto.
Can you just go to the verizon store and ask for a new one? Do they need to see your phone or anything like that, that will tell them its rooted?

raisins said:
I'm having the same problem, I think. When I switch to an LTE option in phone info, it doesn't stay that option. it goes back to CDMA auto.
Can you just go to the verizon store and ask for a new one? Do they need to see your phone or anything like that, that will tell them its rooted?
Click to expand...
Click to collapse
I was afraid and flashed back to stock before taking it in, but the sim card thing is common. so just say you were told by customer service to come in and get a new sim and they will set you up. if you dont feel like going to the store, customer service will overnight you one, pretty much no questions asked. so its no big deal

This is a common problem... i had it too with synergy 1.2. The phone info app was stuck gets stuck on cdma . I had to flash the stock image through odin and flash synergy again. No new sim cards are required
VERIZON GALAXY S 3

DROID3R said:
This is a common problem... i had it too with synergy 1.2. The phone info app was stuck gets stuck on cdma . I had to flash the stock image through odin and flash synergy again. No new sim cards are required
VERIZON GALAXY S 3
Click to expand...
Click to collapse
after flashing back through odin, I still had only 3G

DROID3R said:
This is a common problem... i had it too with synergy 1.2. The phone info app was stuck gets stuck on cdma . I had to flash the stock image through odin and flash synergy again. No new sim cards are required
VERIZON GALAXY S 3
Click to expand...
Click to collapse
When you do that, do you wipe all your data?

raisins said:
When you do that, do you wipe all your data?
Click to expand...
Click to collapse
Check your baseband then head to
http://forum.xda-developers.com/showthread.php?t=1788313 then flash a different radio.. meaning if you running LF2 then flash LG1 and vice versa. After i changed the modem i boot up into 3g went into phone info and chose lte only and 4g turned on.
When it happened to me i was running synergy (LG1-radio)...jellybomb theme..so there must be an issue there . i think its the jellybomb theme since it was made for sprint users
VERIZON GALAXY S 3

e-zzy1 said:
I have the same problem and can't seem to find a solution!!!!
I have two s3 and they both do the same thing!!!
Click to expand...
Click to collapse
Pop up dialer, type *2767*3855#
and it will reset your 4G by fixing the SIM card - and immediately reboot. I've had the problem twice, and both times this key sequence fixed it. :highfive:

So a friend of mine was having the same issue. No 4G in an area I know he has full 4G signal. I reflashed the unrooted stock image in Odin (he was already stock, rooted, unlocked with cwm 6.xx) and still no dice. I tried flashing both radios, no dice. Also tried the dialing above to reset everything, nothing. Finally I gave up and told him to take it in into a store and they replaced the sim card and it worked! We then rerooted, unlocked, flashed cwm and all was good.
However, I asked him what all he had originally done after getting the phone so that we could try to take it step by step and see what caused it. I installed TiBu and lucky patcher as he had previously done (I don't condone pirating, espeically this great app but I wanted to try and recreate the issue) and it broke it, no 4G! I think the culprit was lucky patcher; I highly doubt TiBu could cause it as I have had no trouble with it. Only other rooted app he installed was adblock but again, I use this all the time with no troubles. I told him to just pay for the app! But I am still interested if anyone else might have had the same issue so we could try to prevent it for others? Any of you above who lost 4G did you by chance use lucky patcher?
Edit: Also, i noticed that I put the phone in 4G LTE only mode using phone info the 4G LTE symbol pops up but there are no signal bars. However, it appears as if there is signal since data speeds work fine and at normal LTE for this area so just the bars are screwed up, and then something with the hand off when switching back to normal off LTE only? Anyone else exeriencing this or have you tried to see if you actually have LTE even though you have no bars?

Same crap on my white 16gb gs3. Ridiculous data connections.
---------- Post added at 03:50 AM ---------- Previous post was at 03:42 AM ----------
I have a replacement coming. They sent it a week ago and I got it yesterday and they sent me a nexus. Maybe its a sign to go back to the good ol gnex. They resent a gs3 so if the new one doesn't fix it I'm going to keep the gnex they sent and cut my loss
Sent from my SCH-I535 using xda app-developers app

[Q] [SOLVED] Loose mobile data and APN's after any/every JB flash.

This happens every time I flash a JB ROM.
Everything else seems to work fine.
But...
As soon as I disable wifi, my mobile data greys out and I have no internet connection. If I re-enable wifi, my mobile data comes back.
If I am out of wifi range, mobile data greys out and no internet connection.
When mobile data works....it works.
Looking at my APN settings shows no APN's at all. It will let me populate a new APN, but when I press "save" it just goes away and leaves nothing. I've tried rebooting after also.
My IMEI information shows up in the settings screen. Not jibberish.
Flashing back to stock restores my mobile data fine.
Mobile data works fine when I upgrade to ICS from GB before attempting JB.
The phone reacts to flashing exactly as the instructions indicate.
This has happened every time I try to go from ICS to JB.
I tried completely wiping (int sd and all)my phone before flashing (over and over again) and I'm following andros instructions fully.
While on JB, could using Odin to restore an efs backup I made while on GB help this? Is it possible to just upload the backup without returning to stock? I tried to restore the efs backup with Root Explorer but it didn't fix anything obviously. And I can't seem to even connect fully using EFS Pro (won't see com ports on the Qualcomm screen). Nitrality is an app that claims to backup/restore the efs folder but I haven't tried restoring one yet.
I'm not even sure the problem lies within the efs folder.
Ive gone through this a million times and it is the same no matter what I do or "try". It is the same for me with any JB ROM.
Searching the forum has gotten me this far, but now I'm stuck. Any help would be greatly appreciated as I refuse to accept failure.
Sent from my SGH-I997 using Tapatalk 2

Re: [Q] Loose mobile data and APN's after any/every JB flash.
Now I'm thinking an app like GetRil might solve this. But the Infuse is unsupported.
Does anyone know of a similar app that supports the Infuse?
Sent from my SGH-I997 using Tapatalk 2

idk..this may sound silly but if you want to try:
1. go back to stock gb
2. take out sd card
3. factory reset
4. cm9 flash twice..run it to see it imei and data is intact. then boot into cwm. factory reset
5. flash a 4.1.1 build..check imei and mobile data.
6. then flash 4.2.1 build
...disclosure: i'm guessing

Re: [Q] Loose mobile data and APN's after any/every JB flash.
Hmm. Interesting. I didn't think of trying to step up the JB versions. I'll try that and report back. Thx.
Sent from my SGH-I997 using Tapatalk 2

I first re-downloaded all my ROM's and GAPPs on the computer.
I've been able to keep mobile data all the way to 4.1.2.(Paranoid) But after that it's as I described:
IMEI shows up and is correct.
No APN's listed and can't save a new APN.
"Mobile Data Status" shows disconnected.
If wifi is on and connected, mobile data "works" fine, but still shows no APN's and disconnected in settings as above.
Resetting to default APN says it completed, but nothing's there. I tried rebooting after and checking.
Wanna hear something really strange...
Since I knew I was going to have to go back to stock once again, I decided to step back to 4.1.2 just to see what would happen.
4.1.2 installed fine and my mobile data was once again working correctly.
Still working on it.

bufordjustice said:
I first re-downloaded all my ROM's and GAPPs on the computer.
I've been able to keep mobile data all the way to 4.1.2.(Paranoid) But after that it's as I described:
IMEI shows up and is correct.
No APN's listed and can't save a new APN.
"Mobile Data Status" shows disconnected.
If wifi is on and connected, mobile data "works" fine, but still shows no APN's and disconnected in settings as above.
Resetting to default APN says it completed, but nothing's there. I tried rebooting after and checking.
Wanna hear something really strange...
Since I knew I was going to have to go back to stock once again, I decided to step back to 4.1.2 just to see what would happen.
4.1.2 installed fine and my mobile data was once again working correctly.
Still working on it.
Click to expand...
Click to collapse
very odd...I guess your phone doesn't like 4.2.1.
Good luck with it, though.
Sounded like you've pin-pointed the problem to a change from the 4.1.2 to 4.2.1.

Im losing it all after i went back to stock gb 2.3.6

I changed the APN settings on my device as http://forum.xda-developers.com/showthread.php?t=1791526 advised. I'm running 4.2.1 AoCp and my mobile data, MMS, etc. all works fine.

aturbs said:
I changed the APN settings on my device as http://forum.xda-developers.com/showthread.php?t=1791526 advised. I'm running 4.2.1 AoCp and my mobile data, MMS, etc. all works fine.
Click to expand...
Click to collapse
Yup. Those are the settings I try to input, and the thread I try to use to do it. But it won't save.

Re: [Q] Loose mobile data and APN's after any/every JB flash.
bufordjustice said:
Yup. Those are the settings I try to input, and the thread I try to use to do it. But it won't save.
Click to expand...
Click to collapse
Are you themed? Believe it or not....a heavy theme could do crazy things.
From One Of My Many Collective Devices!

mine would loose its imie. i would have to flash back to stock gb and then cm9 let it boot up and then flash cm10 4.1.2 if i flashed another rom before cm10 4.1.2 my imie was gone.i could flash any4.1 or 4.2 rom after flashing cm10 and be fine.

Re: [Q] Loose mobile data and APN's after any/every JB flash.
Wow thanks
Sent from my SGH-I997 using xda premium

Molon Labe said:
Are you themed? Believe it or not....a heavy theme could do crazy things.
From One Of My Many Collective Devices!
Click to expand...
Click to collapse
Thanks but nope.
This happens every time even when starting fresh from stock.
I am not altering the ROM itself before flashing in any way.
Immediately after flashing a 4.2.+ from 4.1.2 the APN's are not appearing. But my IMEI info is.
But if I go back to 4.1, the APN's are there so I'm thinking the APN's aren't being deleted during the flash?
In the process of flashing, I've made sure all the ROM's "worked" and the APN's were there before stepping to the next one.
I feel like I'm insane.

Re: [Q] Loose mobile data and APN's after any/every JB flash.
Can anyone tell me what controls the migration of the APN info when flashing from 4.1 to 4.2?
Also, what controls the addition of new APN's and where are they saved?
Is there any place I can look within the ROM or kernel to help see if the APN info is really missing.
Personally, I think the APN info is there, but something is not installing completely when flashing.
Sent from my SGH-I997 using Tapatalk 2

This thread is exactly what I'm talking about. Unfortunately it's for the SII, but it's the same. The bummer is that we can't run GetRil on the infuse. I'm stuck again. At least it's nice to know I'm not the only one with this particular issue. Any help?
http://forum.xda-developers.com/showthread.php?t=1848749&highlight=dreaded+apn

bufordjustice said:
This thread is exactly what I'm talking about. Unfortunately it's for the SII, but it's the same. The bummer is that we can't run GetRil on the infuse. I'm stuck again. At least it's nice to know I'm not the only one with this particular issue. Any help?
http://forum.xda-developers.com/showthread.php?t=1848749&highlight=dreaded+apn
Click to expand...
Click to collapse
try one of these:
http://forum.xda-developers.com/showthread.php?t=1869159

Working!!!
qkster said:
try one of these:
http://forum.xda-developers.com/showthread.php?t=1869159
Click to expand...
Click to collapse
It's working!!! :good:
I grabbed the UVKJ6 modem, flashed it, and APNs are displayed and working.
I've tested with 4.2.2 versions of Beanstalk, Paranoid, SlimRom, PAC, and The Collective's (shout out to dman who spoiled me with Zeus).
Tried to re-download and install the JB version of my trusty UCLB3 modem, but it would not work (for me) with any of these ROMs.
I've never been so happy to have my notification bar freeze! Lol.
I'm assuming this all has something to do with the stage of development for JB? Idk.
I can't thank you enough. You really came through when I needed help. Thank you Sir.

Good to hear.
You Prolly just needed to re flash a modem.
Blscallions deserves the credit for putting those together.
You can add a [SOLVED] to your thread title

I'm having the same problem as you, but my data won't work at all even after turning wifi on/off. On the pull-down menu it says that I have no service. I would love to try the modem fix, but this is all brand new to me and I have no idea how to do it. Can someone help me out here?

lemonz23 said:
I'm having the same problem as you, but my data won't work at all even after turning wifi on/off. On the pull-down menu it says that I have no service. I would love to try the modem fix, but this is all brand new to me and I have no idea how to do it. Can someone help me out here?
Click to expand...
Click to collapse
I had to flash a different modem. Not sure why, but it fixed my problem. What I did was:
1. Downloaded a few different modems from http://forum.xda-developers.com/showthread.php?p=31097259
2. Reboot into recovery.
3. Select to Install zip from SD card.
4. Locate one of the modem. (In the folder).
5. Flash the modem.
6. Clear cache and dalvik cache.
7. I selected to fix permissions. Probably don't have to do this. But I did.
8. Reboot and test. If it doesn't work, flash another modem and try again.
If no modem works, then its probably not the modem. Hopefully you removed the SD card when flashing from ICS to JB. And hopefully your IMEI # is showing and correct.
It goes quick. I hope this works for you. If you need more detailed instructions, just let me know.
Sent from my SGH-I997 using Tapatalk 2

[Q] 4G LTE Not Working

Guys I've tried searching and tried damn near anything I can think of/find here on XDA and other sites.
Over the weekend I got a little sick of my GPS not locking on my Verizon Samsung Galaxy S3 SCH-I535. I was running CleanRom 7 and I believe I was on MB1 - I could be wrong on the basebad that I was on.
Anyways, after doing my normal reading to see what the latest and greatest things going on are I decided I wanted to do a complete wipe like I'd done in the past, update to MF1 firmware, update my radio to ML1, then put a fresh install of CleamRom 7 on there.
So I used to did a format of my external SD then a factory wipe/reset & cache wipe in CWR. I then went directly into Odin mode (Home Button/Volume Down/Power) and flashed the root66_VZW_I535VRBMA2.7z from this thread. I installed EzUnlocker and RomManager. I unlocked the phone, then flashed CWR. I first did a factory wipe/reset, I then flashed the MF1 firmware, followed by the ML1 radio, and finally Clean Rom 7.
Everything was fine except my 4G LTE would not turn on - 3G works fine but no 4G LTE. I've tried everything I could possibly think of. I've flashed to the prerooted MA2 linked above in Odin. I've tried the 2-3 suggestions in this thread, I've tried making my own APN settings, I've tried the thread which has links for people who are returning their phone to Verizon (plain jane stock). Nothing. All of those bring me the same result: Everything works perfectly fine, but the 4G LTE never shows up. It doesn't matter where I am - I know it is not a network outtage as people in the office have no issues and I always have a connection here and at home.
I've already ordered a new SIM card which should show up tomorrow but did I miss anything? I tried everything I could think of. As of right now I'm back at square one where I'd gone back to MA2, flashed MF1 + ML2 firmware, and back on Clean Rom 7. Stuck with 3G. Any suggestions?
Thanks!

Just Odin flashed the VRALG1 4.0 ICS to bring it back to stock found here in Section 5: http://forum.xda-developers.com/showthread.php?t=1762709. Still no luck.
Am I correct in saying when flashing that it is also flashing the modem/firmware? I want to make sure I'm not missing anything.

I had the same problem not too long ago. My issue was the PRL usually 4G PRL starts with 15xxx but if you go into settings-->about phone-->status you should check to see whether it is a 15xxx or 3xxxx. If the latter a new sim card should fix it right up.
Sent from my SCH-I535 using XDA Free mobile app

alamn8r said:
I had the same problem not too long ago. My issue was the PRL usually 4G PRL starts with 15xxx but if you go into settings-->about phone-->status you should check to see whether it is a 15xxx or 3xxxx. If the latter a new sim card should fix it right up.
Sent from my SCH-I535 using XDA Free mobile app
Click to expand...
Click to collapse
FYI a new SIM cleared it right up.

No data on CM

Hey guys,
I was having a lot of trouble getting CM to boot, but I solved that problem by switching from EXT4 to F2FS
Now, I tried installing CM 13 and CM 12 but for some reason data doesn't work
I feel like such a noob, but this is my first CDMA device. I've always had GSM carriers up until now...
On the stock rom, the phone would do PRL updates and provisioning automatically. I made sure the phone was connected before I wiped and flashed
But it won't catch data. calls and text work fine, but no data. Notification tray says "no sim card - Sprint"
There are a ton of APNs listed, but I wanted to make sure I don't mess with it in the wrong way. That's why I'm asking first...

I don't think anyone has tested CM13 on CDMA yet.
So data works fine on stock right? You mention PRL and provisioning, that stuff can ONLY be done in the stock ROM. PRL shouldn't have much to do with data, but provisioning certainly. So make sure all that is taken care of in stock before you flash anything custom.
Assuming data does work in stock just fine, then I would check to see if any other CM versions work with CDMA data - the last version I believe was successfully tested on CDMA was CM11. I don't know the status past that for CDMA data...

arrrghhh said:
I don't think anyone has tested CM13 on CDMA yet.
So data works fine on stock right? You mention PRL and provisioning, that stuff can ONLY be done in the stock ROM. PRL shouldn't have much to do with data, but provisioning certainly. So make sure all that is taken care of in stock before you flash anything custom.
Assuming data does work in stock just fine, then I would check to see if any other CM versions work with CDMA data - the last version I believe was successfully tested on CDMA was CM11. I don't know the status past that for CDMA data...
Click to expand...
Click to collapse
People have confirmed CDMA data works in the CM13 thread...
Could it be due to the phone being on EXT4 when it was stock and then I changed to F2FS when I flashed CM?
No matter what I tried, the phone wouldn't boot CM on EXT4

gtmaster303 said:
People have confirmed CDMA data works in the CM13 thread...
Could it be due to the phone being on EXT4 when it was stock and then I changed to F2FS when I flashed CM?
No matter what I tried, the phone wouldn't boot CM on EXT4
Click to expand...
Click to collapse
F2FS and EXT4 are just file system formats - has literally nothing to do with data connectivity.
Does data work on stock?
Have people confirmed CDMA data works on your provider, or some other provider?

arrrghhh said:
F2FS and EXT4 are just file system formats - has literally nothing to do with data connectivity.
Does data work on stock?
Have people confirmed CDMA data works on your provider, or some other provider?
Click to expand...
Click to collapse
http://forum.xda-developers.com/showpost.php?p=65135786&postcount=17
http://forum.xda-developers.com/showpost.php?p=65790824&postcount=53
http://forum.xda-developers.com/showpost.php?p=65895808&postcount=58
Yup, multiple confirmations for working data on Sprint
Data worked on stock
I'll take another hard look at the phone this weekend and see where I can get. Hopefully I can get the darn thing to work.
If you have any insight or suggestions, I'd be more than happy to try

gtmaster303 said:
Yup, multiple confirmations for working data on Sprint
Data worked on stock
I'll take another hard look at the phone this weekend and see where I can get. Hopefully I can get the darn thing to work.
If you have any insight or suggestions, I'd be more than happy to try
Click to expand...
Click to collapse
Well if it's working for others without issue... Also, reading those posts you link only one mentions Sprint. One is using GSM, and the other is using some other CDMA provider (they had to add some entry manually in build.prop to get it working).
Hm. You mentioned a ton of APN's. Which one is selected? Last time i ran CM on the Q on Sprint (or Ting) I recall there was only one APN showing...

I have a bunch of APNs on mine too. You may want to check APNs under Cellular network settings. Mine is set to "Sprint internet" and works great for me. It works fine in LTE and 3G areas with no problem. This is on CM13 but 12.1 worked the same way. For some reason I think when I first flashed mine awhile back it might have been just set to "CDMA 0" and I had to change it.

Well technically the phone is running on Ringplus (Sprint MVNO). I have APNs from almost every MVNO and sprint as well
If you guys don't know about them, I would highly suggest you check them out. It's free service. However, there's limited customer support...