Ok I had my bootloader unlocked. Sim network all that unlocked. The bootloader locked by itself now I have no mobile data. And it shows on the fastboot screen fc4 under locked. What does fc4 mean?
Woah. That's rare, I only saw this twice. Though once was on a OP2.
Well, you want to unlock it again? It may hard-brick your device, if you're willing to fix it after hard-bricking it then by all means do so.
What I'd do here is update the system, or sideload an update, then attempt to unlock it. I don't know if that would work though, so do it on your own risk.
If you happen to brick your device then you can flash your stock ROM through EDL mode. Here is a full guide.
I have did everything even went back into tmobile os. Everything worked good except for my mobile network.The sim card was grayed out couldn't access any apn anything to do with mobile data. I just sent it back it was a replacement. See I was fooling around with that unofficial twrp then my network relocked itself then but I was still using my same modem. It wouldn't even let me network unlock anymore TMobile mobile couldn't even unlock it. It was weird
amaroney55 said:
I have did everything even went back into tmobile os. Everything worked good except for my mobile network.The sim card was grayed out couldn't access any apn anything to do with mobile data. I just sent it back it was a replacement. See I was fooling around with that unofficial twrp then my network relocked itself then but I was still using my same modem. It wouldn't even let me network unlock anymore TMobile mobile couldn't even unlock it. It was weird
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I don't think anyone can help you here mate, for all I know you may have a bad motherboard and need a new SoC.
Maybe you should just get a new phone. That's a really rare issue.
You may need to take it back to the T-Mobile store...
Related
Hello all,
I have a Samsung Galaxy S III from AT&T.
I plan on traveling so, I wanted to unlock it. I followed the steps on Android 4.1.1 I believe and it seemed to work (my menus looked identical to the tutorial I followed, but I don't have another SIM to test with). But, I have had the phone for a while and it is really sluggish, so I backed it up and decided to do a hard reset. The phone is running much smoother now, but I did do an AT&T software update which brought it to Android 4.3, and now when I look at the menu after typing *#197328640# and following the steps, when I get to Network Unlock, it looks different. Did the update relock my phone to the AT&T network. Is there a way to verify? Should I just hard reset again and stick with 4.1? Pleas let me know as soon as possible as I am traveling soon.
Thanks for all the help
If your phone was unlocked using any method, it should not relock. You can test it with a non att sim.
audit13 said:
If your phone was unlocked using any method, it should not relock. You can test it with a non att sim.
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How do I test if I don't have access to a non ATT sim, I have one Korean SIM card, but I don't know how to test with it because it is not currently being serviced.
Put in the non-ATT sim, power up the phone. If it does not ask you to enter an network or carrier unlock code, the phone is unlocked.
audit13 said:
Put in the non-ATT sim, power up the phone. If it does not ask you to enter an network or carrier unlock code, the phone is unlocked.
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it shows no signal, but does not ask me for a network or a code. So it should be fine right?
Been experimenting with this phone lately, I managed to flash it to a tmobile s4 with the exception of the modem as we all know its practically impossible to flash it to this phone. I got the NSP code but the issue is that the phone only stays unlocked temporarily. If I reboot the phone it locks again. Would the modem be the one responsible for reseting the network lock? Any advise? Am up for some development on this.
So I get that no one knows or bothers to help here?
aromerblz said:
So I get that no one knows or bothers to help here?
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Generally speaking, the modem isn't in control of the network lock. You can unlock a phone, flash new modem, and remain locked. The SIM lock status is stored elsewhere.
Unfortunately I don't have an explanation for why your unlock doesn't persist.
Marc
Frankenscript said:
Generally speaking, the modem isn't in control of the network lock. You can unlock a phone, flash new modem, and remain locked. The SIM lock status is stored elsewhere.
Unfortunately I don't have an explanation for why your unlock doesn't persist.
Marc
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Thank you for your feedback.. it's appreciated..
Too bad SIM unlock isn't as easy as simply flashing an unlocked modem binary in Odin!
Sent from my SGH-M919 using Tapatalk
Frankenscript said:
Too bad SIM unlock isn't as easy as simply flashing an unlocked modem binary in Odin!
Sent from my SGH-M919 using Tapatalk
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We are yet to see how tracfone will handle this new unlocking policy. definitely they need to provide some time of update to unlock all they lock on there phones.
Any more news on the SGH-S970G? I just picked one up for Straight Talk brand new for $250. Heck of a deal, but I need it to work on T-mobile and flash to a TW rom for wifi calling. I am hoping I don't have to return this...
Chimera says they can unlock it, but I haven't looked in to it much yet.
aromerblz said:
Been experimenting with this phone lately, I managed to flash it to a tmobile s4 with the exception of the modem as we all know its practically impossible to flash it to this phone. I got the NSP code but the issue is that the phone only stays unlocked temporarily. If I reboot the phone it locks again. Would the modem be the one responsible for reseting the network lock? Any advise? Am up for some development on this.
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This is a stab in the dark but here goes. Is there any chance you have SGH-S970G firmware that could be shared. I would be grateful.
Hey there,
I am having some issues with unlocking my D852. The phone is locked to Rogers, and I'm trying to get it over to Telus. I'm in the stock ROM, with the Telus Sim card in it, everything appears to go smoothly after I enter the unlock code. To verify I go into 2945#*852# and check all the menus, the phone is not personalized, and I'm successfully connected to the Telus network. Afterwards I try to restore from a backup, CloudySix, the phone boots. In the status bar its saying that my SIM Card is Perso Locked, and is prompting me for a SIM Network Unlock PIN. I tried entering a few codes, NCK and SIMCK without any luck. I dont want to enter any more codes in case I lock myself out completely.
I have unlocked before, its been a few years, but I have never run into this. Shouldn't the phone be unlocked permanently, no matter what ROM you flash. Maybe I have to flash a new ROM from scratch? I tried restoring CandySIX CM13 edition and the new AOSP based so far.
***EDIT: I forgot to mention, I reverted back to stock, and I get a prompt for the unlock code again.
I just got a Galaxy S6 from Telus and I'm really not happy with it, it feels like a downgrade to me. Hoping you guys can help me out
When you restore your backup are you restoring the EFS partition as well? I think that is where the unlock is stored (at least that's how it is on some phones).
eradicator006 said:
When you restore your backup are you restoring the EFS partition as well? I think that is where the unlock is stored (at least that's how it is on some phones).
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Yeah, I was doing a full restore, EFS and Modem. I tried flashing a ROM from scratch just now and that worked for me. The only problem after that was that my WIFI wasn't working afterwards. I might have to continue messing around with it, making progress though!
Thanks for the help
bean72 said:
Yeah, I was doing a full restore, EFS and Modem. I tried flashing a ROM from scratch just now and that worked for me. The only problem after that was that my WIFI wasn't working afterwards. I might have to continue messing around with it, making progress though!
Thanks for the help
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yeah i think you relocked it
KronicSkillz said:
yeah i think you relocked it
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Got it all up and running, after an hour of troubleshooting I discovered that the WIFI wasn't working because the AP needed a reboot lol. Through all this though, I discovered the importance of the EFS partition, it stores alot more than your unlock data, its best not to touch it
How were you able to unlock the network sim.
Can I do anything to update it, root, debloat, or unlock the bootloader or anything with it?
should I have a bought a different carrier version?
To update I think you need to put in an activated AT&T SIM. You can find on eBay for $2-3
aceofpilots said:
Can I do anything to update it, root, debloat, or unlock the bootloader or anything with it?
should I have a bought a different carrier version?
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Not sure about rooting, but as I have replied to a few guys here about updating. Try removing your Sim card, then factory reset. When it reboots DO NOT connect to WiFi and skip everything to get to the home screen. After your at the home screen connect to WiFi and go to settings and check for updates. If it works, do them one after another until is can't find any more.
That worked for me and the only thing I can think of. It's worth a shot.
Romman0 said:
Not sure about rooting, but as I have replied to a few guys here about updating. Try removing your Sim card, then factory reset. When it reboots DO NOT connect to WiFi and skip everything to get to the home screen. After your at the home screen connect to WiFi and go to settings and check for updates. If it works, do them one after another until is can't find any more.
That worked for me and the only thing I can think of. It's worth a shot.
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Have you tried from US? I'm from other country
I got a new phone, the LM-G820UM AT&T version. I followed this guide: https://forum.xda-developers.com/t/tutorial-crossflash-bypass-opid-mismatched-error.4345963/ to flash the stock firmware. With my SIM card in it says "network locked", it doesn't prompt for the unlock code. I have the unlock code and I've tried the various unlock commands (2945#*71001# and 2945#*20001#), but nothing comes up when I do these. Do I need to get it back to the AT&T firmware to be able to unlock it? If so, how can I do this?
gunnerone007 said:
I got a new phone, the LM-G820UM AT&T version. I followed this guide: https://forum.xda-developers.com/t/tutorial-crossflash-bypass-opid-mismatched-error.4345963/ to flash the stock firmware. With my SIM card in it says "network locked", it doesn't prompt for the unlock code. I have the unlock code and I've tried the various unlock commands (2945#*71001# and 2945#*20001#), but nothing comes up when I do these. Do I need to get it back to the AT&T firmware to be able to unlock it? If so, how can I do this?
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wow, yeah, that's unfortunate. First, yes, it's the at&t firmware that the unlock code works with, not any other firmware.
second, at&t doesn't make their kdz available, so you have no easy way to get back to their firmware.
you might get lucky and find someone who has backed up all their partitions from at&t. Then u would flash ea one back via qfil.
Important lesson: don't buy a locked phone. if u get a locked phone, don't to anything to the firmware until u unlock the phone.
cheers
@AsItLies would this phone work in it's current state with AT&T?
gunnerone007 said:
@AsItLies would this phone work in it's current state with AT&T?
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To the best of my knowledge, no. At&t is one of the carriers that has restrictions for their networks. Last I read (have never used them personally), they only allow phones that have their IMEI (they check that), and it's using their ROM, to access volte and vowifi.
so, would it work? yes and no. Volte and Vowifi may or may not be important to you.
Additionally, I'm absolutely no expert with at&t, so u might just try and find out, my info could be outdated.