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If I want to take the phone back to stock, what do I have to do to get the OTA? The phone said unlocked even before we started rooting it. Do these phones come unlocked (sprint 4g)?
loveubuntu said:
If I want to take the phone back to stock, what do I have to do to get the OTA? The phone said unlocked even before we started rooting it. Do these phones come unlocked (sprint 4g)?
Click to expand...
Click to collapse
What I did was install a stock nandroid through recovery, then relocked my bootloader. Your phone must have been previously rooted, because the phone's do not ship in that state. To re lock your boot loader just boot your phone into the bootloader, start the command prompt on your pc, and then type fastboot oem lock.
Thanks. to go factory condition though, I have to unroot first and then fastboot oem unlock, correct?
You maybe right, if that is how easy to unlock-lock, I may have unlocked it by fastboot oem locked and not remembered (it was late). This is a friends phone and I'm not used to having phones unlocked this easily.
You can leave the boot loader unlocked and still receive ota updates.
Sent from my Galaxy Nexus using XDA App
loveubuntu said:
If I want to take the phone back to stock, what do I have to do to get the OTA? The phone said unlocked even before we started rooting it. Do these phones come unlocked (sprint 4g)?
Click to expand...
Click to collapse
Yeah, OTA updating should have nothing do with whether your bootloader is locked or not
Rooting and unlocking the bootloader will not affect the ota, what will is custom system apps like non stock gmail, or a changed build prop (common from market enabler)
Sent from my Nexus S
I have an AT&T HOX. Came stock with 1.85.
I rooted it using the "redbend" method described here (http://forum.xda-developers.com/showthread.php?t=1709296)
(More or less, the pulling SIM card business wasn't part of the steps when I used it, but the root was successful).
I am using SuperSU to manage root access by apps.
I have not done anything beyond that.
Now, I understand, at some point, AT&T is going to force a 2.20 update on me.
My primary concern is to avoid losing root.
(I have enabled the "preserve root across OTA" in SuperSU, but not sure if its effective or not)
I've looked at the howto's for SuperCID, unlocking the bootloader, etc, and I'm not sure which I NEED, and which are optional, and/or what the pros/cons are of each...
I'd like to stay as close to "stock" as possible, but I want to ensure that I can keep root.
I'm still within my AT&T contract, and would really prefer to avoid bricking the phone.
I'm wondering what the recommendations are as to the minimum steps I should take to keep root in the event the OTA is forced on me?
Can I pre-empty the OTA by installing this? ( http://forum.xda-developers.com/showthread.php?t=1812459 )
If so, what is the safest method for installing it?
FWIW, I am a linux user, and I am comfortable with adb as well as the command line on the phone itself.
I have no windows systems, so any special tools I'd need other than adb I'd have to find a linux version.
I don't need "one click" methods, in fact I'd prefer to see/perform the individual steps and understand what they are doing.
unlock your bootloader using this method http://forum.xda-developers.com/showthread.php?t=1672284 if you don't you wont get root again afterwards.
Dont have to unlock to flash roms?
This document,
http://onexroot.com/one-x-root/root-any-htc-one-x-windowsmaclinuxattinternationalone-click-method/
Near the very bottom, suggests:
For AT&T HTC One XL and alike, if you want to install custom ROMs, you don’t have to unlock your bootloader but simply flash custom recovery in fastboot.
Is this accurate?
My ATT HOX is currently rooted, and I now have SuperCID. I assumed I would need to unlock my bootloader, but I havent done that yet.
Can I install this:
https://play.google.com/store/apps/details?id=com.s0up.goomanager
and then use it to install the "Stock Rooted AT&T 2.20.502.7" here?
http://forum.xda-developers.com/showthread.php?t=1812459
And if I do that, will this avoid AT&T OTA'ing me?
On a relatated note, would the SuperCID survive the OTA, allowing me to unlock the bootloader afterward, even if I hadnt done so already?
Megadave123 said:
This document,
http://onexroot.com/one-x-root/root-any-htc-one-x-windowsmaclinuxattinternationalone-click-method/
Near the very bottom, suggests:
For AT&T HTC One XL and alike, if you want to install custom ROMs, you don’t have to unlock your bootloader but simply flash custom recovery in fastboot.
Is this accurate?
Click to expand...
Click to collapse
Completely false. You cannot install custom recovery without unlocked bootloader. For the safety of your device, I'd suggest sticking with XDA, and not Googling random websites. That website obviously has incorrect information.
Megadave123 said:
and then use it to install the "Stock Rooted AT&T 2.20.502.7" here?
http://forum.xda-developers.com/showthread.php?t=1812459
And if I do that, will this avoid AT&T OTA'ing me?
Click to expand...
Click to collapse
AT&T isn't going to "OTA" you by force. You have to accept the download, then accept the installation. Cancelling either of those will prevent the OTA from being installed.
If you want to update to the stock 2.20 firmware without running the OTA or RUU (and therefore keep the ability to flash kernels and radios), than yes, the ROM you linked is the method I would suggest. But you would need to unlock the bootloader, then install TWRP before you can flash the rooted 2.20. Also keep in mind there are newer (than 2.20) firmwares already posted in Development (2.23, 2.29, etc.) in similar pre-rooted form. Not to mention custom ROMs based on 2.20 or newer.
Megadave123 said:
On a relatated note, would the SuperCID survive the OTA, allowing me to unlock the bootloader afterward, even if I hadnt done so already?
Click to expand...
Click to collapse
SuperCID survives OTA. But the 2.20 OTA has a new hboot, which fixes the hole by which kernels and radios can be flashed from recovery, so my recommendation would be not to install the OTA.
redpoint73 said:
Completely false. You cannot install custom recovery without unlocked bootloader. For the safety of your device, I'd suggest sticking with XDA, and not Googling random websites. That website obviously has incorrect information.
Click to expand...
Click to collapse
FWIW, I didnt google that site. It was linked to from an XDA post. I't didnt seem right to me, which is why I asked here
AT&T isn't going to "OTA" you by force. You have to accept the download, then accept the installation. Cancelling either of those will prevent the OTA from being installed.
If you want to update to the stock 2.20 firmware without running the OTA or RUU (and therefore keep the ability to flash kernels and radios), than yes, the ROM you linked is the method I would suggest. But you would need to unlock the bootloader, then install TWRP before you can flash the rooted 2.20. Also keep in mind there are newer (than 2.20) firmwares already posted in Development (2.23, 2.29, etc.) in similar pre-rooted form. Not to mention custom ROMs based on 2.20 or newer.
Click to expand...
Click to collapse
Ok, that is VERY good to hear.
BTW, thank you very much. I read somewhere that ATT could/might force the OTA, and I've been worried about losing root ever since, but not quite ready to (presumably) completely void my warranty with a bootloader unlock.
Megadave123 said:
BTW, thank you very much. I read somewhere that ATT could/might force the OTA, and I've been worried about losing root ever since, but not quite ready to (presumably) completely void my warranty with a bootloader unlock.
Click to expand...
Click to collapse
I think bypassing the user acceptance dialogues for the OTA install would be a violation of how Android fundamentally works. It would be a serious security issue, as it might allow rogue software to be installed on your device without your interaction. I seriously doubt AT&T would institute such a thing.
The user confirmation of the OTA might be a liability thing, too. If the performance of the device is adversely affected by the OTA (happens to some people) and the OTA was forced by AT&T without the owner having a choice, it would seem to me that AT&T has to accept the responsibility. People can claim its AT&T's fault, and demand a replacement device (since AT&T technically installed the software remotely). By making you confirm the OTA installation (and giving you the chance to opt out), you pretty much are volunteering to install the software and accept the consequences.
In theory, unlocking the bootloader voids you warranty. But more than a few folks on here have gotten warranty replacements from AT&T (after unlocking the bootloader), without issue. Sometimes in-store (within the first 30 days) without them even checking for the bootloader unlock. No guarantee that this will always be the case. But just throwing it out there. Its still up to you whether unlocking the BL is worth the risk in your own case.
I dont remember but isnt hoxl supported by goomanager? As long as your rooted you can install a recovery from it with a locked bootloader. I always reccomend unlocking but im pretty sure its not a total necessity to get twrp recovery
18th.abn said:
I dont remember but isnt hoxl supported by goomanager? As long as your rooted you can install a recovery from it with a locked bootloader. I always reccomend unlocking but im pretty sure its not a total necessity to get twrp recovery
Click to expand...
Click to collapse
The hoxl is officially supported by twrp and can be downloaded from goomanager. I do not know if you can install a custom recovery without an unlocked bootloader. I would be interested to know if this can be done as well.
Sent from my Nocturnalized One XL using Forum Runner
when you try to push a recovery via fastboot with a locked bootloader it will fail due to invalid signature I don't see how goomanager would be any different.
Is there any harm in trying it?
If I install "goo manager", and let it do its thing, and the locked bootloader prevents it from doing so, there wont be any other side effects, will there?
If I come off as a complete noob at this - its because I am..
This is my first Android phone, and I *really* want to avoid bricking it, so I want to make sure I understand as much as possible before I go
trying to do anything to it.
Also I'm still wary of unlocking, mainly because of the whole "will erase your phone" bit.
I'm not yet fully comfortable that I know how/what to fully backup all of "my" data on the phone so as to facilitate easily putting it all back.
I'll answer some q's here.
1.) you cannot flash a custom recovery from hboot with a locked bootloader
2.) you CAN dd a custom recovery with a locked bootloader. However your device will be soft-bricked.
3.) you CAN install custom ROM's via dd right from android. This is how we did it back "in the day".
4.) you "might" be able to get away with dd'ing a custom kernel with locked BL, not not sure. In fact, I'd bet it will softbrick now that I think about it.
Anyways, the SAFEST way to do it is via unlocking the bootloader and installing your roms from custom recovery.
gunnyman said:
when you try to push a recovery via fastboot with a locked bootloader it will fail due to invalid signature I don't see how goomanager would be any different.
Click to expand...
Click to collapse
Beaups pretty much already answered it. But this guy tried installing TWRP thru goomanager with a locked bootloader, and confirmed it doesn't work: http://forum.xda-developers.com/showthread.php?p=31220704#post31220704
So I'm a long time HTC owner and my sister just got an S5 I plan to root tonight.
I'm also thinking of returning my M8 for an S5 after I check out my sisters. But I'm not sure I want to give up the M8 speakers.
Anyway I'm curious for others with experience from both sides about some terminology HTC vs Samsung.
1) Do "leaked" RUU's exist. These are official "Kits" that will basically put a phone back to factory (Firmware, Root Status, Recovery) etc.
It will do everything except remove S-OFF (see below). They are handy to have for warranty work and you botched something.
Often cleanly built ROM's are built from a base RUU rather than a "Dump".
2) Does anything like S-OFF exist. HTC phones can be typically exploited such that you have "S-OFF". This basically means you can install any firmware (radio etc.) beyond Android, Recovery.
3) Once rooted, will you get OTA updates? Will and OTA remove root? Could you loose root access through an OTA update?
With S-OFF none of this matters.
4) Without S-OFF it can be awkward to update the Kernels sometimes. Can the Kernels be easily updated with "Just" Root.
5) Does the phone display "Tampered" or "Unlocked" once rooted. If so how easy is it to remove that and get it back to factory after being rooted.
mswlogo said:
So I'm a long time HTC owner and my sister just got an S5 I plan to root tonight.
I'm also thinking of returning my M8 for an S5 after I check out my sisters. But I'm not sure I want to give up the M8 speakers.
Anyway I'm curious for others with experience from both sides about some terminology HTC vs Samsung.
1) Do "leaked" RUU's exist. These are official "Kits" that will basically put a phone back to factory (Firmware, Root Status, Recovery) etc.
It will do everything except remove S-OFF (see below). They are handy to have for warranty work and you botched something.
Often cleanly built ROM's are built from a base RUU rather than a "Dump".
2) Does anything like S-OFF exist. HTC phones can be typically exploited such that you have "S-OFF". This basically means you can install any firmware (radio etc.) beyond Android, Recovery.
3) Once rooted, will you get OTA updates? Will and OTA remove root? Could you loose root access through an OTA update?
With S-OFF none of this matters.
4) Without S-OFF it can be awkward to update the Kernels sometimes. Can the Kernels be easily updated with "Just" Root.
5) Does the phone display "Tampered" or "Unlocked" once rooted. If so how easy is it to remove that and get it back to factory after being rooted.
Click to expand...
Click to collapse
I will do my best....
1) Yes. Leaked do exist but are minimal for this phone at the moment. Samsung makes the current available for download right from them or is available in this forum. Just flash via Odin and will restore it to factory stock.
2) If I'm not mistaken the Sprint S5 bootloader is not locked. Therefore all you need to do is root and can flash away.
3) If you take an OTA while rooted you will lose root. However, it will not be possible to take the OTA successfully with a custom recovery installed. Best bet is to wait until someone modifies the OTA and re-packages for root users. Usually only takes a few days after official OTA is dropped.
4) Yes. Just a quick flash.
5) Yes. Status will change and cannot go back at this time once it is tripped. Can still go back to factory with stock recovery but status will still not be "Official".
Anyone please someone chime in and correct me on any of these if I am mistaken.
CCallahan said:
I will do my best....
1) Yes. Leaked do exist but are minimal for this phone at the moment. Samsung makes the current available for download right from them or is available in this forum. Just flash via Odin and will restore it to factory stock.
2) If I'm not mistaken the Sprint S5 bootloader is not locked. Therefore all you need to do is root and can flash away.
3) If you take an OTA while rooted you will lose root. However, it will not be possible to take the OTA successfully with a custom recovery installed. Best bet is to wait until someone modifies the OTA and re-packages for root users. Usually only takes a few days after official OTA is dropped.
4) Yes. Just a quick flash.
5) Yes. Status will change and cannot go back at this time once it is tripped. Can still go back to factory with stock recovery but status will still not be "Official".
Anyone please someone chime in and correct me on any of these if I am mistaken.
Click to expand...
Click to collapse
Status will be official (in settings "About Phone"). Just when you boot into download mode, knox counter tripped will be shown (0x1).
lol i remember asking all these questions exactly in reverse when i went from the s3 to the one...thanks goodness i came for the s4
On a more superficial note, you can also get a more htc vibe by installing the blinkfeed app thats been ported over by gakugaku. More info here ->
http://forum.xda-developers.com/showthread.php?t=2735764
Coming over to samsung after 6years with Htc was a little jarring, but this kinda softened the transition.
Thanks guys that was exactly what I needed. My sisters phone rooted just fine.
I did compare her phone to mine briefly and posted here about it.
http://forum.xda-developers.com/showthread.php?t=2749699
To sway me to the S5, I really wanted to like the S5 camera (at least as much), the Cell Reception and live with the speakers.
But that is proving really difficult.
The M8 has me very nervous of failing again especially when I keep seeing reports of owners having the same issue I did (lost 3G).
I think I'm trading my m8 to a guy straight across for the s5. I never had any problems with my s3 and the m8 has been a headache, but not for everyone. I know how you feel mswlogo.
Hello!
I have N5 from the first batch. GPS is like ***, recently even worse, problems with microphone etc. I've decided to return the phone. However, my problem is that the phone was bought in USA while I stay in EU. So I have to prepare the phone perfectly before I send it to my friend who will deal with returning it to google.
List of sins: unlocked bootloader, CM a lot, now upgraded to Android 5.0 (using factory images from google). Till the update the device was not modified. However, I'm little bit scared, because bootloader seems to be unlocked.
Is my warranty void? Or can simply I return the phone with bootloader unlocked? If no, please help - is there a step-by-step guide on how to completly return to stock including locking bootloader? Returning to 4.4.4. is ok, I'm sending the phone back to USA anyway
I'll be extremly greateful for help.
Br,
Piecho
Just flash back to stock relock bootloader.
You need the nexus 5 toolkit .
Sent from my Nexus 5 using xda premium
Reflash stock rom then return it as it is. Google does not care about have the bootloader unlocked or not.
Don't use any toolkit learn the proper commands and do it manually. The Google factory images page gives you step by step instructions. Like said before, Google doesn't care about unlocked boot loader. The factory images page even tells you to unlock, flash, then relock lol
Hey guys, I'm wondering if anyone has done this, or knows if it's possible to (after unlocking bootloader) flash the Google stock Pixel system image instead of the Verizon one? I'm assuming the hardware and firmware are identical, but am not sure and am not skilled enough (or at all) in code to know if its possible. I bought my phone through Verizon, only because nowhere else had stock. I use it on T-Mobile, but fear there may be some behind the scenes Verizon stuff going on that may hinder my phone on T-Mobile. I haven't experienced any issues yet, but with the Nov security update mentioning a specific fix for wifi calling in New Mexico only on the Verizon pixels, it makes me weary that there is more happening beneath the surface than I am aware of. Thanks for any and all help! Appreciate it.
newbienic said:
Hey guys, I'm wondering if anyone has done this, or knows if it's possible to (after unlocking bootloader) flash the Google stock Pixel system image instead of the Verizon one? I'm assuming the hardware and firmware are identical, but am not sure and am not skilled enough (or at all) in code to know if its possible. I bought my phone through Verizon, only because nowhere else had stock. I use it on T-Mobile, but fear there may be some behind the scenes Verizon stuff going on that may hinder my phone on T-Mobile. I haven't experienced any issues yet, but with the Nov security update mentioning a specific fix for wifi calling in New Mexico only on the Verizon pixels, it makes me weary that there is more happening beneath the surface than I am aware of. Thanks for any and all help! Appreciate it.
Click to expand...
Click to collapse
I did yesterday, bought mine from Best Buy and I unlock the BL. Sideload the OTA yesterday and I used NDE63V that comes with new radio. oh I'm also on Tmobile
jay661972 said:
I did yesterday, bought mine from Best Buy and I unlock the BL. Sideload the OTA yesterday and I used NDE63V that comes with new radio. oh I'm also on Tmobile
Click to expand...
Click to collapse
Awesome! Thanks for the info... Really glad to know I can convert if need be. Thanks again!
jay661972 said:
I did yesterday, bought mine from Best Buy and I unlock the BL. Sideload the OTA yesterday and I used NDE63V that comes with new radio. oh I'm also on Tmobile
Click to expand...
Click to collapse
Interesting side note on this...
I went ahead and unlocked my bootloader and flashed Google's stock Pixel image. All went well, no problems... Until I tried to use Android Pay. It's telling me my software can't be verified. And I out of curiosity checked, and the "allow OEM unlocking" in developer options is still greyed out, and not selectable, even though my BL is unlocked. Hoping this doesn't mean that we can't take an OTA. Weird, I guess we'll have to wait and see when next month's security update comes out...
newbienic said:
Interesting side note on this...
I went ahead and unlocked my bootloader and flashed Google's stock Pixel image. All went well, no problems... Until I tried to use Android Pay. It's telling me my software can't be verified. And I out of curiosity checked, and the "allow OEM unlocking" in developer options is still greyed out, and not selectable, even though my BL is unlocked. Hoping this doesn't mean that we can't take an OTA. Weird, I guess we'll have to wait and see when next month's security update comes out...
Click to expand...
Click to collapse
Just having an unlocked bootloader trips SafetyNet now and you can't use Android Pay without a custom kernel.
ITGuy11 said:
Just having an unlocked bootloader trips SafetyNet now and you can't use Android Pay without a custom kernel.
Click to expand...
Click to collapse
And the OEM unlock option appears to be dependent on device ID (imeid? Ccid?), And not the software. So don't relock it, and you're fine
Sent from my Pixel using Tapatalk
danaff37 said:
And the OEM unlock option appears to be dependent on device ID (imeid? Ccid?), And not the software. So don't relock it, and you're fine
Sent from my Pixel using Tapatalk
Click to expand...
Click to collapse
One thing I just realized, is in Developer Options, its greyed out like I mentioned, but also says "Bootloader is already unlocked". Which I actually remember seeing on my Nexus 5x when the bootloader was unlocked. It's got me really curious about re locking the bootloader. Mainly cause I actually use Android Pay. Had no idea bootloader unlocks are actually tripping safety net now. Major bummer. If anyone has gone through this process with a Verizon pixel and has actually relocked their bootloader with no issues I'd certainly appreciate any info you have. Otherwise, I may have to dive in blind and hope for the best.
If you want to use Android pay, flash a custom kernel but don't root. Works for me.
Don't relock if you ever want to have it rooted, custom, etc. The unlock method isn't going to survive another security update.
Sent from my Pixel using Tapatalk
danaff37 said:
If you want to use Android pay, flash a custom kernel but don't root. Works for me.
Don't relock if you ever want to have it rooted, custom, etc. The unlock method isn't going to survive another security update.
Sent from my Pixel using Tapatalk
Click to expand...
Click to collapse
Hypathetically, if I didn't want root or anything custom at all, do you think that relocking the bootloader could cause an issue while using the Stock Google image on a Verizon Pixel? I wish I had more knowledge on this, but I'm pretty in the dark on this stuff as of late... Thanks for your help!
Should be fine if all stock I think, just know that you may not be able to unlock later.
Sent from my Pixel using Tapatalk
newbienic said:
One thing I just realized, is in Developer Options, its greyed out like I mentioned, but also says "Bootloader is already unlocked". Which I actually remember seeing on my Nexus 5x when the bootloader was unlocked. It's got me really curious about re locking the bootloader. Mainly cause I actually use Android Pay. Had no idea bootloader unlocks are actually tripping safety net now. Major bummer. If anyone has gone through this process with a Verizon pixel and has actually relocked their bootloader with no issues I'd certainly appreciate any info you have. Otherwise, I may have to dive in blind and hope for the best.
Click to expand...
Click to collapse
Contrary to what people are saying. You CAN relock your bootloader and then unlock it again later. However, keep in mind that at some point there will likely be an update that blocks the use of dePixel8 and you will no longer be able to unlock the bootloader unless someone writes another exploit.
I would like to find a way to permanently unlock VZW Pixels but until I get one from the Google Store to compare with my Verizon one I don't think I will make much progress.
Relocking your bootloader is as simple as running the "fastboot oem lock" command from the terminal window.
Lastly. If you want to relock the bootloader, make sure your phone is 100% stock image or you risk bricking the phone
If I were to buy the Verizon pixel and flash the unlocked (non European) image. How do you think updates would work? Would I get seamless updates from Google or would I need to flash every Ota manually. Might be too early to tell
b316kane said:
If I were to buy the Verizon pixel and flash the unlocked (non European) image. How do you think updates would work? Would I get seamless updates from Google or would I need to flash every Ota manually. Might be too early to tell
Click to expand...
Click to collapse
This is exactly what I did, and I am curious as well... We'll see next month I guess, but I'm guessing it will take the OTA just fine. My wife has a Pixel from the Google store, and mine is from Verizon. I've compared everything (including booloaders) since flashing the Google store Pixel image, and every informational detail is identical. Not sure if there is some other place hidden to me that might indicate a difference, but I'm thinking that Verizon's Pixel is only different in its official software image... And, that may be it. Please don't take my word for it, I'm no developer, and know very little about any of this, but in my comparisons, they are identical now since flashing Googles official (Non Verizon, Non European) image.
Sidenote, I have yet to try this, but I'm thinking that since I am on Googles image, that if I re-lock my bootloader, that I WILL be able to unlock again after locking. I think Verizon used Googles "Allow OEM Unlocking" software toggle in developer options as the only method to actually keep people from unlocking the bootloader (again speculative), and now that I'm on Googles image, that software "block" should no longer be present, so I should in theory, be free to lock/unlock the same as Pixels purchased from the Google store... Again, I've got no proof, or actual skill to back this up, but it's a theory I have, and if I end up locking my BL again, I'll post what I find...
newbienic said:
I have yet to try this, but I'm thinking that since I am on Googles image, that if I re-lock my bootloader, that I WILL be able to unlock again after locking.
Click to expand...
Click to collapse
In the Verizon unlocking threads the people that tried relocking reported that they were unable to unlock again without depixel8, which is the same as how the Verizon phone typically works. Some people seem to have gotten into situations that could have been corrected with an unlocked bootloader, but because they had a locked bootloader that couldn't be unlocked using depixel8 they had no easy solution to get their phone working again at this time.
http://forum.xda-developers.com/pixel-xl/how-to/psa-read-relocking-bootloader-t3494615
alluringreality said:
In the Verizon unlocking threads the people that tried relocking reported that they were unable to unlock again without depixel8, which is the same as how the Verizon phone typically works. Some people seem to have gotten into situations that could have been corrected with an unlocked bootloader, but because they had a locked bootloader that couldn't be unlocked using depixel8 they had no easy solution to get their phone working again at this time.
http://forum.xda-developers.com/pixel-xl/how-to/psa-read-relocking-bootloader-t3494615
Click to expand...
Click to collapse
Thanks for the heads up!!! Like I said, I really know nothing, just speculating. Appreciate you looking out.
newbienic said:
Thanks for the heads up!!! Like I said, I really know nothing, just speculating. Appreciate you looking out.
Click to expand...
Click to collapse
I forget where, but I saw written or implied that the "checking for updates" screen about third of way through initial setup of first boot uses WiFi AND sim carrier data to install Verizon custom restrictions and settings that among other effects make depixel8 required.
Even on "non Verizon phones" (which you are saying use the same build images byte to byte?)... You have to either use a SIM card or wifi and google account to allow the developer options to enable OEM unlock.
My theory: In other words, if you don't allow via SIM and a network wifi or data connect, for Verizon to mark your phone, or another carrier, then the phone can not be unlocked. So carrier models may indeed be differentiated from current factory images AFTER boot and setup.
There is a post in Q&A of someone trying to unlock bootloader without loading into the device, not having luck. This is why oem unlock toggle is so important and why people are bricking from locked bootloaders that won't unlock (so no wipe and factory images cannot be flashed.)
Another thing to consider: SIM network lock will not be flashed over.
Sent from my sailfish using XDA Labs