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Hello,
I have called Sprint many times, after they keep telling me it is unlocked domestically and internationally, I finally gave up. The phone simply says to contact sprint to unlock. I have no idea what to do. When I press UCCI Unlock it gives me an internal error(407). I tried flashing unlocked firmware (U1) But it does not work on that either. Tried booting up with T-Mobile sim inside, still same result. What to do?
Please help!
I had the same problem. I did a factory reset of my phone, and afterwards, the phone was automatically unlocked. For me, it seemed like a firmware bug.
Hi all. After the phone get unlocked, flash the U1 firmware and you'll be just fine. On the U1 firmware, T-Mobile is the only US carrier network that utilize the full potential of the U1 firmware, Wi-Fi calling and VoLTE. Verizon second with VoLTE, Sprint and AT&T no ? good on U1 firmware, only standard U firmware. Happy flashing
Hey all,
I was given an S9 (Exynos version, unlocked, SM-960F/DS) that had TWRP installed on it, but was stuck in a boot loop. After messing with it for a while, I stuck it in a drawer and forgot about it until recently, when I pulled it out and decided to just restore it to stock. I downloaded a ROM for that specific model from this site ( https://forum.xda-developers.com/galaxy-s9/how-to/official-firmware-thread-regions-t3765015 ) and flashed it using Odin. This got the device to boot fine to the setup, but it defaulted to German, and rejected any SIM I put in it, even though the phone was originally unlocked. So my question is, now how do I remove the SIM lock again? I'm guessing I'll first have to wait the 7 days for the OEM unlock cooldown to elapse again so I can reinstall TWRP?
tattar8 said:
Hey all,
I was given an S9 (Exynos version, unlocked, SM-960F/DS) that had TWRP installed on it, but was stuck in a boot loop. After messing with it for a while, I stuck it in a drawer and forgot about it until recently, when I pulled it out and decided to just restore it to stock. I downloaded a ROM for that specific model from this site ( https://forum.xda-developers.com/galaxy-s9/how-to/official-firmware-thread-regions-t3765015 ) and flashed it using Odin. This got the device to boot fine to the setup, but it defaulted to German, and rejected any SIM I put in it, even though the phone was originally unlocked. So my question is, now how do I remove the SIM lock again? I'm guessing I'll first have to wait the 7 days for the OEM unlock cooldown to elapse again so I can reinstall TWRP?
Click to expand...
Click to collapse
TWRP/Root/Custom has nothing to do with SIM locks, you'd need a sim unlocking service for that
*Detection* said:
TWRP/Root/Custom has nothing to do with SIM locks, you'd need a sim unlocking service for that
Click to expand...
Click to collapse
Then why would the phone start demanding a PUK for any SIM I insert into it after flashing, when it didn't before? The SIMs work on any other phone I try them in.
tattar8 said:
Then why would the phone start demanding a PUK for any SIM I insert into it after flashing, when it didn't before? The SIMs work on any other phone I try them in.
Click to expand...
Click to collapse
Because certain SIM unlocking services depend on you not wiping the phone in order to keep the unlock
You'll need to unlock it again using a paid service
*Detection* said:
Because certain SIM unlocking services depend on you not wiping the phone in order to keep the unlock
You'll need to unlock it again using a paid service
Click to expand...
Click to collapse
The phone was never locked to a carrier -- it was purchased sealed, factory unlocked.
tattar8 said:
The phone was never locked to a carrier -- it was purchased sealed, factory unlocked.
Click to expand...
Click to collapse
In that case check it has not been IMEI blacklisted due to non payment of contract or reported stolen, you state in your OP it was given to you
If it is IMEI blocked there's nothing XDA can do to help you
*Detection* said:
In that case check it has not been IMEI blacklisted due to non payment of contract or reported stolen, you state in your OP it was given to you
If it is IMEI blocked there's nothing XDA can do to help you
Click to expand...
Click to collapse
What I meant by that was that a friend of mine handed it to me to try to fix after he messed with it in TWRP, getting it stuck bootlooping in the process. He had bought it factory unlocked. I checked the IMEI, it's clean. It's demanding PUKs for any SIM I put in it, even though those SIMs work in other phones; I tried a Ting SIM and a Cricket SIM.
tattar8 said:
What I meant by that was that a friend of mine handed it to me to try to fix after he messed with it in TWRP, getting it stuck bootlooping in the process. He had bought it factory unlocked. I checked the IMEI, it's clean. It's demanding PUKs for any SIM I put in it, even though those SIMs work in other phones; I tried a Ting SIM and a Cricket SIM.
Click to expand...
Click to collapse
Well the only thing I can think is to flash a stock firmware for the region you are in, pick a carrier firmware to force the CSC change, Multi-CSC that contains Germany will default back to that if that is what the phone's original CSC was, but I doubt CSC is causing this
O2U CSC (United Kingdom) for G960F is a single CSC, flash it using CSC and not HOME_CSC along with the other 3 sections
But it seems to me this was not originally a factory unlocked handset, it was unlocked by an unlocking service and sold as one
If that doesn't work, pay for an unlocking service
*Detection* said:
Well the only thing I can think is to flash a stock firmware for the region you are in, pick a carrier firmware to force the CSC change, Multi-CSC that contains Germany will default back to that if that is what the phone's original CSC was, but I doubt CSC is causing this
O2U CSC (United Kingdom) for G960F is a single CSC, flash it using CSC and not HOME_CSC along with the other 3 sections
But it seems to me this was not originally a factory unlocked handset, it was unlocked by an unlocking service and sold as one
If that doesn't work, pay for an unlocking service
Click to expand...
Click to collapse
Is there a way I can find out what carrier the phone thinks it's locked to, or would I just have to get SIM cards from around the world and try them?
Can I do this without enabling OEM Unlock (so without letting the phone run for 7 days)?
tattar8 said:
Is there a way I can find out what carrier the phone thinks it's locked to, or would I just have to get SIM cards from around the world and try them?
Can I do this without enabling OEM Unlock (so without letting the phone run for 7 days)?
Click to expand...
Click to collapse
Samsung Phone INFO will tell you the current CSC, but if it defaulted to German either you flashed a German firmware or that is the default CSC
OEM unlock is only needed for custom
Flashing a Multi-CSC ROM such as BTU for United Kingdom will have the greatest chance of it defaulting to it's original CSC
I used that app, and it indeed says the phone's CSC is German, Deutsche Telekom from what I could tell. I tried flashing a number of different FW packages (including the UK and Singapore ones) but it still defaulted to German each time.
I tried going to their unlock page and entering the IMEI, but they have no record of it being sold by them.
tattar8 said:
I used that app, and it indeed says the phone's CSC is German, Deutsche Telekom from what I could tell. I tried flashing a number of different FW packages (including the UK and Singapore ones) but it still defaulted to German each time.
I tried going to their unlock page and entering the IMEI, but they have no record of it being sold by them.
Click to expand...
Click to collapse
Like I said, try flashing a carrier branded firmware like O2U, it cannot default to German if that CSC is not included
Flash using CSC and not HOME_CSC
Sim lock is on its own secure enclave chip, so if this was truly Sim unlocked then it isn't even possible to "relock". Either was unlocked in an unreputable way, or is IMEI blocked as mentioned before.
So I just got time to re-visit this project. I flashed O2U firmware, and it defaulted to English and shows the corresponding CSC. The phone is still locked, and I checked a bunch of IMEI blacklist checkers and each one comes back clean. At this point I accept that the phone is actually locked by a carrier, so I need to instead figure out how to get it unlocked, and to do that I need to figure out what carrier it's locked to. Like I said earlier, I tried entering the IMEI into Deutsche Telekom's unlocking page, and they have no record of them having locked that phone. So how would I go about figuring out what carrier it's locked to? If that information is on its own secure enclave chip, is there any way to read it?
Afaik german providers are forbidden by law to simlock phones for several years already. Problem must be somewhere else.
Try entering the PUK of any SIM if that's what's requested. It should be on the full size SIM, else contact your mobile network operator.
Hope I could get some good advice from the collective. This week my wife and I changed our carrier from ATT to TMOB. I have a Fold 4 and she a Fold 3. Her went perfectly. Mine, not so much.
Both phones were paid off in advance. No balance for either on ATT.
We started out and got the unlock code from the old ATT carrier for both phones.
We got the code to port the existing telephone numbers from the old carrier ATT.
We established out TMOB account.
When we scanned the QR code for TMOB with the fold 4, it asked for the ATT provided unlock code, which it accepted
Fold 4 rebooted
BAD: The Fold 4 booted with the old ATT logo, not the TMOB logo, but it come up with the esim on TMOB.
Good: The fold 3 booted up with the TMOB logon, and it downloaded all the TMOB bloat, and came up with the esim on TMOB
BAD: On the Fold 4, I cannot seem to get 5G service, because the CSC still points to ATT even though in Settings==>Connections it recognized it is on TMOB
So I supidly flashed the TMOB firmware from Sammy, which was the same Oct 1 security release I had on the phone. I used HOME_CSC to prevent data wiping.
When the Fold 4 rebooted, it went into RECOVERY and told me it required a FACTORY RESET. Would not boot up normally. I tried many times
Performed FACTORY RESET. Restored the phone from SAMMY Cloud.
Same issue - still no 5G service still usnign ATT CSC
Called TMOB and they recommended I remove the esim. Mistrake - then I had no service.
Went to TMOB store and they provided a real SIM so I got service back
But still on the ATT CSC
Told me to go back to ATT, but they say it is unlocked?
Any advice how to force the phone to use the TMOB CSC? Phone is NOT rooted. I know if I root it I can force the change. But I don't want to root it.
Thanks in advance.
Flame Red said:
Hope I could get some good advice from the collective. This week my wife and I changed our carrier from ATT to TMOB. I have a Fold 4 and she a Fold 3. Her went perfectly. Mine, not so much.
Both phones were paid off in advance. No balance for either on ATT.
We started out and got the unlock code from the old ATT carrier for both phones.
We got the code to port the existing telephone numbers from the old carrier ATT.
We established out TMOB account.
When we scanned the QR code for TMOB with the fold 4, it asked for the ATT provided unlock code, which it accepted
Fold 4 rebooted
BAD: The Fold 4 booted with the old ATT logo, not the TMOB logo, but it come up with the esim on TMOB.
Good: The fold 3 booted up with the TMOB logon, and it downloaded all the TMOB bloat, and came up with the esim on TMOB
BAD: On the Fold 4, I cannot seem to get 5G service, because the CSC still points to ATT even though in Settings==>Connections it recognized it is on TMOB
So I supidly flashed the TMOB firmware from Sammy, which was the same Oct 1 security release I had on the phone. I used HOME_CSC to prevent data wiping.
When the Fold 4 rebooted, it went into RECOVERY and told me it required a FACTORY RESET. Would not boot up normally. I tried many times
Performed FACTORY RESET. Restored the phone from SAMMY Cloud.
Same issue - still no 5G service still usnign ATT CSC
Called TMOB and they recommended I remove the esim. Mistrake - then I had no service.
Went to TMOB store and they provided a real SIM so I got service back
But still on the ATT CSC
Told me to go back to ATT, but they say it is unlocked?
Any advice how to force the phone to use the TMOB CSC? Phone is NOT rooted. I know if I root it I can force the change. But I don't want to root it.
Thanks in advance.
Click to expand...
Click to collapse
I would use a patched ODIN and fully flash TMB firmware alongside user_data, it would be a fully factory reset but it will be T-Mobile from the very beginning.
xlylegaman said:
I would use a patched ODIN and fully flash TMB firmware alongside user_data, it would be a fully factory reset but it will be T-Mobile from the very beginning.
Click to expand...
Click to collapse
Ah, I did not use a patched Odin. Perhaps that is where I went wrong?
I did flash User Data.
Thank you for the suggestion!
In case this is helpful to others with the Fold 4 and the wrong CSC, I was able to change from ATT to TMOB using SamFW FRP Tool V3.1 (not the latest, but one that had a working CSC changer).
At the end it said it was rebooting, but it never did and I just manually restarted it and all was good
Flame Red said:
In case this is helpful to others with the Fold 4 and the wrong CSC, I was able to change from ATT to TMOB using SamFW FRP Tool V3.1 (not the latest, but one that had a working CSC changer).
At the end it said it was rebooting, but it never did and I just manually restarted it and all was good
Click to expand...
Click to collapse
Thanks this may help my situation
Can you flash unlock CSC to use T-Mobile on Verizon?
I feel like I've done a big door.
I work in a cell repair shop and we had an ATT unlocked S20 FE that came in and I liked it so I bought it.
Long story short. I did some reading that you can install the XAA software using patched Odin. This was essential because I'm on Tmobile and didnt get 5G on the ATT firmware.
Easy enough. The device now has 5G access on Tmobile, and identifies itself as SM-G781U1/DS in settings.
The issue I'm facing is now unlocking the bootloader. The XAA firmware doesn't have the option and I'm unable to flash back to ATT firmware without (auth) fail errors in Odin and 'Secure boot check fail: PIT' on download mode.
Here's what I've tried that's failed so far:
- show option using time/date change
- software updating (I do receive OTA)
- flashing stock ATT firmware
- flashing stock TMB firmware
- Fastboot oem unlock (command not found)
- fastboot getvar unlocked (unlocked: no)
I'm about out of ideas, could use some guidance on where to begin looking next, I really like the power of this phone and wanna see what custom roms bring.
Device stats:
Galaxy S20FE SM-G781U (with U1 XAA flash)
CSC: ATT
Build: G781U1UESAGWC7
Service provider info:
G781U1_OYM_TMB_13_0011
TMB/TMB/ATT
Android 13, One UI 5.1
To be honest the custom rom screne for this phone is not so great yet. I imagine once the official support ends we will be getting some well developed custom roms.
As for the bootloader unlock issue, try using smartswitch to restore stock firmware, or try changing only the CSC if the firmware is multi-csc, the oem unlock option might reapper.
What kind of patched odin did you use to flash the XAA firmware? stock odin should be able to flash it too. As far as i am aware north american samsung phones do not offer oem unlock. The option probably dissapeared for good. There was etoken but since you are on android 13 i imagine the exploits have been already patched. You're basically stuck on XAA now. You can try using samkey to change the csc but i doubt that even that can help you oem unlock it.
hoptockets said:
I feel like I've done a big door.
I work in a cell repair shop and we had an ATT unlocked S20 FE that came in and I liked it so I bought it.
Long story short. I did some reading that you can install the XAA software using patched Odin. This was essential because I'm on Tmobile and didnt get 5G on the ATT firmware.
Easy enough. The device now has 5G access on Tmobile, and identifies itself as SM-G781U1/DS in settings.
The issue I'm facing is now unlocking the bootloader. The XAA firmware doesn't have the option and I'm unable to flash back to ATT firmware without (auth) fail errors in Odin and 'Secure boot check fail: PIT' on download mode.
Here's what I've tried that's failed so far:
- show option using time/date change
- software updating (I do receive OTA)
- flashing stock ATT firmware
- flashing stock TMB firmware
- Fastboot oem unlock (command not found)
- fastboot getvar unlocked (unlocked: no)
I'm about out of ideas, could use some guidance on where to begin looking next, I really like the power of this phone and wanna see what custom roms bring.
Device stats:
Galaxy S20FE SM-G781U (with U1 XAA flash)
CSC: ATT
Build: G781U1UESAGWC7
Service provider info:
G781U1_OYM_TMB_13_0011
TMB/TMB/ATT
Android 13, One UI 5.1
Click to expand...
Click to collapse
for some reason Samsung doesn't allow bootloader unlocks in the US anymore. if as a phone repair guy you have the means force older firmware onto the device then you could pay someone to get an unlock token on the DL from a contact of theirs.
downgrading isn't something we can do at all hence me mentioning you maybe having access to resources others don't.
if you could get it onto the very first firmware you'd have a chance, if you can't there's no chance.
I would appreciate if anyone can point me to the right direction. I have 21FE G990U2 from AT&T, It is unlocked by AT&T.
All I need is working T-Mobile firmware or Samsung (no carrier branding) to flash. I tried multiple versions of U, U1 and U3 firmwares (all matching my current Binary -4) but no success.
I just would like to get rid of ATT bloat. I know I can uninstall it via ADB but I rather have firmware clean of it.
Any suggestion please?
Thanks
So am I right to assume that you are looking for a G990U2 TMB firmware with Binary 4, to flash on a G990U2 AT&T phone?
If so, then you can download it from the below link by clicking on "Download Samfw server" (G990U2OYN4EWC3, April 2023 update):
Download Galaxy S21 FE 5G SM-G990U2 (TMB) G990U2SQS4EWC3 in Samfw - Samsung firmware download
Galaxy S21 FE 5G SM-G990U2 (TMB - United States) G990U2SQS4EWC3 T(Android 13) samsung firmware download all model, lastest, fast update, completely free and fast speed in Samfw.com ✅
samfw.com
or if I am assuming wrong, can you please correct my understanding? As I do not have any practical hands-on experience with the USA models.
Shuhan44 said:
So am I right to assume that you are looking for a G990U2 TMB firmware with Binary 4, to flash on a G990U2 AT&T phone?
If so, then you can download it from the below link directly (G990U2OYN4EWC3, April 2023 update):
https://02-samsung.cloud/v2/IxJCDiMnLh8SLAo5IRtBAzwDMyMyCB4lFzssIDs2ByAzMUEgOzEUQDMQMCMBOyw/LiUzJjIXCDkuJC8/NDseIy8xIQYzOAIlPDAVHRIvMz81CAIkMwsuOB42FA00Nh4LNS8vFjIXLA0NFzE/PAMeOTMADTkDAC4mNBEaMCExQQEhJQUUHjFCMTs4BkIjCyI/Iws8MQEWCDAeCw0xCREHOTQbIyshAD4OIQAGLC44Hiw0ER4OMiUzLDIlDSs8AD4fJhsGOg8HCkA8AywnCRc+Di8LBxAzBy4RDxYpKTwkHjUeBylCJgceKTIXIUAJER4OMi8+AwMSMBsBAzY5LwNBJi8IMAQ4MTQUAQMgLyMsHjM7JDMHLzEjJDgAISk8PxQ9NTggQiYbLyUhJCEpMjsHJzw2KSceFy4QIzEvKw8WIAYhFh4JMjAeLDQsLCM0Gy45IzgGQiMDPB0jJCI/ARYFMCMiExM=
or if I am assuming wrong, can you please correct my understanding? As I do not have any practical hands-on experience with the USA models.
Click to expand...
Click to collapse
You are correct - I need T-Mobile (or carrier free) so I can utilize full carrier settings.
Thanks for the link, however above link gives an error when opening the page.
Nevertheless I will look for TMB firmware with CSC: G990U2OYN4EWC3 and post an update here
Flashed that and still has AT&T boot logo and all the apps
h078 said:
Flashed that and still has AT&T boot logo and all the apps
Click to expand...
Click to collapse
Well, I am sure that you have flashed by a Factory reset (Flashed CSC, not Home CSC in ODIN). The boot logo can be changed by rooting your device, also bloatware apps can be deleted via ADB command without rooting.. but you already have mentioned that you prefer not to proceed with those processes. So I am out of suggestions, sorry.
Just for my knowledge, after flashing the TMB firmware, now your settings> About phone> software information> service provider software version: 2nd line shows as TMB/ TMB/ AT&T?
(Also corrected the download link in my previous comment anyway).
Yes, you are correct i did flash CSC, not home CSC. Then I reflashed w home CSC but software still says ATT/ATT/ATT.
Moreover on Bootloader screen says "carrier ATT" - I have never seen that before on any Samsung phone that I had. I have no clue how did they lock up device that well. As for removing software via ADB that is not a problem, but ATT locks network selection mode so you cant choose between 5G, LTE, 3G etc..
TMobile in US still supports EDGE and sometimes it comes handy - whereas ATT has only LTE and 5G as they re-farmed EDGE and 3G/HSPA frequencies
h078 said:
Yes, you are correct i did flash CSC, not home CSC. Then I reflashed w home CSC but software still says ATT/ATT/ATT.
Moreover on Bootloader screen says "carrier ATT" - I have never seen that before on any Samsung phone that I had. I have no clue how did they lock up device that well. As for removing software via ADB that is not a problem, but ATT locks network selection mode so you cant choose between 5G, LTE, 3G etc..
TMobile in US still supports EDGE and sometimes it comes handy - whereas ATT has only LTE and 5G as they re-farmed EDGE and 3G/HSPA frequencies
Click to expand...
Click to collapse
I do not get why the CSC can never be changed, even after flashing the complete firmware... must be an ATT thing!
Anyway, to change the csc only, there is another very quick & easy method. It takes only 2/3 minutes; no flash or factory reset is required. You have to download and install a small software "SamFW Tool" on your pc/laptop (may need to disable the antivirus during the download/install process). Once done, connect the phone and enable USB debugging mode. Open the software, under the ADB tab, click Change CSC, from the dropdown list select TMB and click Change. The phone will restart and CSC "Should" change to TMB/TMB/ATT.
Here is the download link for the software:
https://www.mediafire.com/file/upaiwadhmstm6js/SamFwToolSetup_v4.6.zip/file
That did the trick. I have T-Mobile CSC now
Thanks a lot
h078 said:
That did the trick. I have T-Mobile CSC now
Thanks a lot
Click to expand...
Click to collapse
Great!
But still, that's only one part of the final solution I think. Your target was to replace the complete firmware from ATT to TMB, right? Since the CSC is now changed to TMB, I think you can give it another try via ODIN to install the TMB firmware now (only if you want). I am not confident that it will work now, but still, one last try should not be much of a hassle.
I think that these multi CSC contain all US carrier customizations....When I changed it to TMB it shows TMB/TMB/ATT and loads bootlogo as well as TMobile apps... I guess it is similar as Blackberry used to be back in the days...Depending which carrier SIM used it loaded proper settings from the firmware...
I have flash my METROPCS G990U2 to G990U3,other sim card work fine,but t mobile sim card does not work ,can someone help me?I already change CSC to xxa,but still no internet,I do have sginal bar