bootloader locked? - Galaxy S 5 Q&A, Help & Troubleshooting

I have just bought a "new" s5 g900f with the intention of installing a custom ROM, the phone is unlocked from the factory apparently, but it was off ebay and I can't help thinking it may be a refurbished carrier locked device previously, so it may still have a locked bootloader. So how can I tell without flashing anything if it is locked or not
Edit: unlocked! Did some more research then flashed twrp, all OK

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G900V firmware on my G900A phone

Hei all,
I bought my phone off ebay without realizing that there are different models for different markets. However inside the battery case the model number is SM-G900A. Since I off course wanted the latest android version that my wife has on her G900F I went about googling for a solution. After lots of tries and lots of failures, I eventually managed to root my phone with towelroot. I went on to flash a G900V firmware onto my phone (Don't ask why). Now I have a G900V baseband, bootloader and rom entirely. I then went on to update OTA to end up with Android 6.0.1 version only to realize that it cannot be rooted yet. I then went back to 5.0 in order to root and to install custom Twrp 3.0.2.2 recovery and unlock the bootloader to developer mode using sambootloader unlocker.
My question is this: How the h... was I able to transform my G900A to a G900V model to begin with. This is over a year ago, and I cannot remember how I went about it. What I do remember is that I used ODIN, with a G900V pit file and did a complete wipe checking repartition, nand erase all, phone efs clear, and bootloader update.
Now my follow up question is this: If it was possible to "transform" my G900A into G900V, would it be possible to "transform" it into a G900F model given that the hardware on the phone is identical ? I mean what is it that makes the phone a G900V, G900F, G900A model in the first place ?
Would it be possible to completely repartition the internal memory of the phone and flash a complete G900F package with bootloader, recovery, system, modems etc ?
If you are inclined to answer this with a short no, then please be so kind to explain why my phone now only accepts G900V firmware ?
You have done something very risky
Flashing another phone's PIT is a quick way to hardbrick (*i've done it before. what an argue at the service center!*)
Don't try to convert to a G900F... that's an even more different phone
Simply flash G900A PIT+FIRMWARE
Also, NEVER TOUCH any checkboxes in Odin like nand erase all and phone efs clear! Your phone will never work on cell signal again.
There is no way it should not accept ATT firmware because the signing key is in true ROM on Qualcomm S5s I believe
this is risky and dangerous i know all partitions except bootloaders can be flashed with flashfire on a bootloader unlocked phone but ive never heard of someone flashing bootloaders succesfully i wouldnt attempt it and agree with lightning i do remember g900a and g900v modems seem to be compatible but im dangerously curious can you remeber anything else oja60
[email protected] said:
this is risky and dangerous i know all partitions except bootloaders can be flashed with flashfire on a bootloader unlocked phone but ive never heard of someone flashing bootloaders succesfully i wouldnt attempt it and agree with lightning i do remember g900a and g900v modems seem to be compatible but im dangerously curious can you remeber anything else oja60
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Click to collapse
No, not really. All I can remember is best described in the post above. I bought an S5 from ebay, probably delivered from asia somewhere. The back of the phone said G900A and I was curious as to why I couldn't get any OTA-updates. I the downloaded a G900V pit file and a stock G900V ROM from sammobile, and went at it. After installing it all the phone worked like a charm, so I could then go about rooting and unlocking the bootloader with the above mentioned method.
I have now gotten a hold of a G900F phone which I wanted to begin with. That means I could try the procedure again to see If it's possible to convert the now G900V phone into a G900F in the same way. I need to specify this however: We are not talking about running a G900F ROM on an unlocked G900V bootloader here (That's easy!). This is about converting the whole shambam. What I still haven't gotten an answer to is what makes a G900V a G900V and what makes the other models unique ?
Best regards
OJA

HELP P10 Lite BRICKED?

Hello, I'm new here and I'm not english so I'm sorry if there will be some errors.
I have a P10 Lite, 4GB ram 32GB storage. Model WAS-LX1A. It was branded TIM (an italian provider)
Somedays ago I unlocked OEM from settings and Unlocked the Bootloader, then I tried to flash some ROMs that I found here on XDA, everything was fine but when I flashed the ROM, it left me with a blackscreen, so just today I tried some this tutorial to flash back to stock, kind of. It worked, but every 2/3 minutes it restarted. I saw on the thread that one of them had my same problem, he said that he solved with HwOTA7, I was following HwOTA tutorial but I had FRP Locked because of the Back to stock process (i still had bootloader unlocked), i saw that to unlock again FRP (that i need for HwOTA) was necessary to relock bootloader, i locked it, but since then my phone boots only on the TWRP that i installed from the "back to stock" tutorial, and i have bootloader and frp locked. i cannot unlock bootloader again because frp is locked. please help.
ultimatepumperx1 said:
send support ticket to huawei and lock your oem and unlock it with same code
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Click to collapse
i have no access to my phone's settings

Locking bootloader on US variant xt1806

I went to switch to a different carrier, and was on cricket, and also tried tmobile both wich worked fine unlocked bootloader and rooted.
I then switched to sprint, and verizon and found out both carriers the phone would not work right. The data worked but the call and texting did not.
As a side note, I was informed by someone who was on sprint, and he said that you had to get on the network unrooted and locked bootloader, once registered you could then root and get the bootloader unlocked and be just fine.
So I then proceeded to unroot the phone ie: removing everything root, and keeping twrp with an unocked bootloader only, no sign of root. I took the phone back to the stores and tried again, and the phone still had the same issue.
After finally finding a way to finally after 6mo lock the bootloader again, and was at pure stock, locked bootloader and no root.
What this tells me is that some how verizon and sprint both some how some way detect an unlocked bootloader....how? I have no clue, I've never in my 5+ years of rooting multiple phones, never ever ever seen anything like this. The only reason I know this is what it was, is from common deduction and reasoning.........unroot = still doesn't work.....locked bl = works fine with not a single issue. Keep in mind this was all with base stock rom, not a custom rom.....everything was stock, accept for the root and un;ocked bootloader part. I rooted with magisk.
Since I had a very long time and issue with locking the bootloader, (about 6mo) after trying a ton of things, without resolve, I FINALLY got the bootloader locked.
If it's going to be anything like before trying to get it locked again to work on sprint and verzion, I really do not want to bother with unlocking it to begin with. It was an utter nightmare to get locked, no matter what I tried it just would not lock for whatever reason.
So given all that, my question is, how hard or easy is it now to unlock and lock the bootloader?

Bootloader locked on xt1680, wiped phone - cannot install stock rom back to it!

My friend has an odd phone. I believe it to be an XT1680 - the latin american model.
Prior to this issue it showed in the device info as a moto g4.
We suspect maybe it had a tech or service rom flashed to it at *some point*
The IMEI listed could not get him an unlock code. The IMEI on the sim tray however did.
He tried to unlock the bootloader and in the process wiped the phone. So now he's stuck with a locked bootloader and no OS on his phone.
How do we salvage this?
We've tried reflashing several different firmwares, but with no luck. The motorola rescue tool does not recognize his phone.
English is his second language (He speaks it fantastically well!) so I told him I'd post this to get him started.
Thanks guys, I want to see this phone function again!
XT-1680 is a G5 Plus so device info showing G4 is odd. Unlocking wipes data not the system partition. Also you don't need an unlocked bootloader to flash firmware files. Fastboot might show some error. Is it booting into fastboot? Try flashing the latest firmware. What firmware was it on before trying to unlock.

Re-lock bootloader

I have a TMO long ago converted to OOS & rooted. I'm trading it in & concerned Oneplus will reject it with an unlocked bootloader. My research suggests that it must be returned to full stock before re-locking. Does this mean just unrooting or do I have to return it to TMO stock. first?

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