Re-lock bootloader - OnePlus 6T Questions & Answers

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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[PSA] Read before relocking your bootloader

I'm not sure what is up, this isn't a new thing, but people keep coming to me (1-2 a day) with this issue.
If your phone isn't stock, DO NOT RELOCK your bootloader. You will 'soft brick' it, and at this time there is no easy route to fixing it.
If you are on EE UK, Verizon or another carrier blocking bootloader unlocks, and you used dePixel8 to unlock it, DO NOT relock your bootloader unless you are sure you don't want it unlocked again.
Finally, dePixel8 is UNSUPPORTED. Don't come to me if you can't get it to work, don't come to me if you used it them messed up your phone by flashing something bad or whatever. Its on you.
Great announcement. With the monthly security update out today, it is recommended that you don't install the update or have automatic updates enabled.

H918 (T-Mo) SIM Unlock issue

Hello all,
I have a V20 on T-Mo (still on version 10d) and it has an unlocked bootloader and is rooted. It is running the stock ROM.
I have met all the T-Mo requirements to unlock it (40 days, etc) and when I try to use their official unlock app, it stalls out with the circle spinning around the padlock stating "Connecting to Server" but it never goes further. T-Mo support was useless.
So, my question is, does an unlocked bootloader/rooted device prevent this app from working? If so, can I flash back a stock, unrooted ROM using TWRP and then unlock it and then restore my backup?
Thanks!
-Rob
Hey Rob, I had the same issue. Once you flash back to stock it will work and then you can sim unlock. I lost TWRP so I had to go through the process again to root. I used the LG backup app to back up and restored from that after root.

bootloader locked?

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

Is relocking bootloader possible for H990DS

I have been thinking about rooting my v20(H990DS) and I was wondering if there is way to relock the bootloader afterwards in order to receive the oreo update (if ever released). Also after relocking will I still have warranty or not? I will probably use Dirty Santas guide for rooting.
Any help?
Yes you can relock your bootloader, however, unless you want to lose root, that isn't how you would want to upgrade to Oreo if you want to keep root.
LG phones don't have a knox style indicator to show if (or how many times) the bootloader has been unlocked. I have sent various V20 phones to LG for warranty repair after I bricked them trying to root them -- take that however you like.
-- Brian

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?

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