yashsingh1/xdaforums huggingface dataset:
[OnePlus 8 Guides, News, & Discussion] dulcediablo:
I have read and reread the entire thread, including updated OP and I am still very confused.

I do not want to root, what I would like is simply to convert from T-Mobile to Global and relock the bootloader. I am just interested in faster updates and dual SIM (whenever that is fixed by OnePlus).

Can this be done safely?
[OnePlus 8 Guides, News, & Discussion] gerguter:
Yes.
[OnePlus 8 Guides, News, & Discussion] Jacob O Link:
No. If you break your persist without rooting to get a backup, you will lose the fingerprint sensor. You need the persist backup which you get from a backup needing root to get back the FP sensor If you mess it up.(I messed mine up, and I got it all correct. I got into global firmware my first try and it worked amazing. But my FP sensor didn't.) I am getting a replacement from one plus now because I didn't make a backup. Please take precautions and just quickly root, and backup your persist.
[OnePlus 8 Guides, News, & Discussion] Jacob O Link:
I cannot answer that fully, I know that after flashing global FW the correct way, I had signal, and never had to flash a modem, and after updating OXYGENOS i never had to flash the modem either, I believe it is based on what changes in the FW updates maybe. As for persist, I doubt it, only if it breaks and pushing updates should not break persist.
[OnePlus 8 Guides, News, & Discussion] mexiken:
Can vouch for this method, as well. Following the original steps did not work. I had to add the extra step of updating. To recap, this is what DIDN'T work:

MSM, unlock bootloader, flash all, update

What DID work:

MSM, UPDATE, unlock bootloader, flash all, update

Phone working great. It seems that the folks who lost persist were rooting, and flashing the modem from a backup, which is only necessary when you follow the first set of steps, that leaves you without signal, in some cases....
[OnePlus 8 Guides, News, & Discussion] knightsh:
Mexiken after using MSM to downgrade why update? Has anyone tried on most recent update without downgrading?
[OnePlus 8 Guides, News, & Discussion] garz:
Which version to you update to?
[OnePlus 8 Guides, News, & Discussion] themoveforward:
Is there any way to convert without unlocking the bootloader? Or is there any way to relock the bootloader after conversion? I know there used to be a patched version of MSM to complete this for the 6T/7.
[OnePlus 8 Guides, News, & Discussion] parsa5:
Relock is possible. I did it. Unlocking bootloader is a requirement, currently.
[OnePlus 8 Guides, News, & Discussion] knightsh:
Ok, be nice guys. I received my unlock code today from OnePlus. File is called unlock_code.bin

When trying to flash in fastboot I get an error saying it can't load the file. I had no problem getting my unlock code to send to OnePlus and I can still run the command to see it on my phone. Any ideas why it won't flash?

Update* search is our friend. I know. So I found another thread and have now successfully unlocked my device.
[OnePlus 8 Guides, News, & Discussion] bluemoel:
Just curious, has anyone who has flashed global, if you take your sim card out and put it in another phone then put it back into your op8, does your modem still work? I've done this now twice with two different op8 TMO. And both times it's completely lost service and the ability to access apn settings.

oh and be prepared to have to reflash everything with msm tool. i could not get service back even with flashing modems etc.... i dont know what the hell but yeah it completely stumped me.
[OnePlus 8 Guides, News, & Discussion] iKevin:
Did you make a backup of persist.img and modem before flashing it to global?

After you flash global, you are supposed to flash those persist.img (hardware calibration values for finger print scanner) and Tmo modem 5G file on the global.
[OnePlus 8 Guides, News, & Discussion] Cai2629:
Warning: Losing Signal/Network completely after sim card swap or removal

Hey guys, I am not sure if any one of you ran to the same issue I've had. Basically, I successfully converted my Tmobile Oneplus 8 to Global following the process everyone has posted here, even backed up my modem thru TWRP. I also was able to have my persist working for my fingerprint. I think there is a catch and underlying issue here that is unavoidable. Please do not remove your sim card as it will permanently remove your signal and network eve if you flash your modem backup it won't work. You would have to start from scratch by MSM restore. I tested this 3 times and it always came out the same result. Removing the sim card will eliminate your signal and network. It will recognize your sim car but no network. I tried every workaround but nothing.

In simple terms this global conversion is not a complete working success. DO NOT CONVERT TO GLOBAL IF YOU DO NOT WANT TO RUN INTO THIS ISSUE. STAY T-MOBILE UNTIL THIS IS RECTIFIED.

---------- Post added at 10:55 PM ---------- Previous post was at 10:49 PM ----------

yes, i just posted a reply to everyone. I just noticed you just beat me to it. I encountered the same issue. Removal of sim card will disable network signal. The modem backup restore will not fix it, you have to reflash through msm tool, even the fastboot flash all does not work, it will brick your phone and put you in to qualcomm crash dump mode.
[OnePlus 8 Guides, News, & Discussion] Jhoopes517:
How'd you manage upgrading? Every time I try I get told that system update installation failed
[OnePlus 8 Guides, News, & Discussion] bluemoel:
​

Yeah man wild, I thought I was tripping or something the first time. And in that while mess of trying to fix it j ended up accidently deleting my persist backup and reserve image I posted a while back trying to figure a way to fix it without backup. Anyway I ended taking it back to TMobile and getting another one through warrenty, I even gave it to them bootloader unlocked with global still on it.....lol but then I got the new one and went through the motions to contact girl in Twitter to get some unlock and then wait for unlock bin. Well when I got it just the way I wanted it again. I ended up taking out the Sim to see if yhis note10+ was a clone or not (it was a clone) pretty damn good one too. I ended up locking this one up too. Luckily I have about 30 copy's of my f

Persist and reserve img. In my opinion I would always back both those up. If you mess up your reserve img your never getting another ota again. And it was even easier to do. You can also see a while back I promised a version of TMobile 10.5.8 ota img and it kept failing. That was why. So beware guys
[OnePlus 8 Guides, News, & Discussion] bluemoel:
im still running global but thats because i hate the tobile logo boot animation....lol reminds me of the mustachio man from 1984 pointing at me. we need a way to debrand this devices. what happens if you replace the files from the global unbrick tool with the tmobile unbrick tool so use lets say the tmobile unbrick program but have it flash the global firmware. probably just will throw an error right?
[OnePlus 8 Guides, News, & Discussion] tjfaulk08:
OnePlus 8 TMO version

ok so I unlocked it and unlocked bootloader and installed global version with oneplus's support (absolutely no help at all) finally got phone to work again however my wifi calling and stuff still doesn't work I'm still not able to disable delete or remove tmobile bloatware please can you give me some guidance
[OnePlus 8 Guides, News, & Discussion] Ibussatti:
Quick question, will unlocking my bootloader wipe any of my data?
[OnePlus 8 Guides, News, & Discussion] knightsh:
Yep, unlocking bootloader wipes device.
[OnePlus 8 Guides, News, & Discussion] Ibussatti:
Thanks, now the dumb question. Can we skip the wipe process?:confused::confused:
[OnePlus 8 Guides, News, & Discussion] iKevin:
No, we cannot. The only way is to backup your phone, unlock bootloader (wipe), and restore it.
[OnePlus 8 Guides, News, & Discussion] paperecho:
I have the Verizon branded OnePlus 8 5g UW. Has anyone tried to convert it to the global version? Verizon has bloated this thing out the wazoo.
[OnePlus 8 Guides, News, & Discussion] ecompton59:
just go try again right after but nake sure no magisk mod are installed
[OnePlus 8 Guides, News, & Discussion] Jhoopes517:
Yeah, I've done no root or anything.

I'm going to try going back to tmo stock, re-global, and see if I can flash 11
[OnePlus 8 Guides, News, & Discussion] rekman:
For everyone who updated after msm, can someone explain the purpose? What am I missing....if you revert to an older os, then update, it just seems counterintuitive.

Maybe I'm missing something obvious
[OnePlus 8 Guides, News, & Discussion] ecompton59:
By try again meaning go to local in system update then try again same update it works I have no clue what other dude meant
[OnePlus 8 Guides, News, & Discussion] skleveno:
Awesome ty
[OnePlus 8 Guides, News, & Discussion] parsa5:
For a lot of us, the conversion fails if you do not update after msm. We get stuck with no signal. However, if you update post msm then it seems to generally work.
[OnePlus 8 Guides, News, & Discussion] mimix2ppp:
I got a used OP8 pro (chinese) and in Bootloader it shows:

BOOTLOADER VERSION -

BASEBAND VERSION -

they're empty, there's nothing

there should be something?

is something broken?

can it be saved?

'fastboot devices' doesnt properly detect it

also - what's the crucial difference between global and chinese?

thanks!
[OnePlus 8 Guides, News, & Discussion] dulcediablo:
Did you experience the same issues some other guys are warning about when SIM swapping?

I just got my unlock_code.bin from OnePlus and I'm a little nervous after seeing those posts. This phone is my daily driver and it's not paid for so I don't want to mess it up. I wonder if some of the issues are due to rooting and/or installing twrp that is messing up some partitions. I'm not interested in any of that I just want the global rom for dual sim and faster updates.
[OnePlus 8 Guides, News, & Discussion] rekman:
Not OP, but I also experienced the problem when taking the sim card out after switching to global. I read about it in this forum, then forgot about it, and took the sim card out the next day. Boom, no signal. Had to start from msm again.

Side note: my order of steps was msm to 10.5.7, unlock bootloader, flash all with fastboot global rom, then update to latest global. I had no loss of signal at any point. I know some have needed to update after msm to avoid that. Maybe I got lucky. I also didn't root bc I didn't want to.

Just don't take your sim out after!
[OnePlus 8 Guides, News, & Discussion] iKevin:
It is a must to msm to 10.5.7 first?

Does 5G for Tmo still work after you switched to the global rom or you had to flash the modem?

Did you also have to back up and restore the persist.img for the finger print to work properly?
[OnePlus 8 Guides, News, & Discussion] mimix2ppp:
anyone?
[OnePlus 8 Guides, News, & Discussion] knightsh:
Of those who successfully converted from T-Mobile to Global, did you relock bootloader? If so, how? Any problems doing so?
[OnePlus 8 Guides, News, & Discussion] rekman:
1. Yes.

2. Yes. I didn't have to reflash the modem, signal worked after global flash.

3. I backed up the persist.img but I didn't need to restore it. So my other post was wrong. I had to root in order to do that. Whoops. Haha
[OnePlus 8 Guides, News, & Discussion] levil401:
Can you convert to international with a locked bootloader?
[OnePlus 8 Guides, News, & Discussion] knightsh:
Nope. Have to unlock.
[OnePlus 8 Guides, News, & Discussion] iKevin:
3. Without restoring the persist.img, your finger print sensor still works OK?

4. You msn OOS for Tmo 10.5.7 from the links below right?

https://xdaforums.com/oneplus-8/how-to/op8-unbrick-tool-to-restore-device-to-t4093043

https://androidfilehost.com/?fid=4349826312261823571

Thanks!
[OnePlus 8 Guides, News, & Discussion] rekman:
3. Yes, finger print works fine. But some have had issues.

4. Yes.
[OnePlus 8 Guides, News, & Discussion] iKevin:
3. Ahh you are so lucky, the persist.img is just the fp calibration values. Usually there is "default" values baked into the ROM, my guess is that for your particular phone, the "default" values were close to the actual "calibrated" values. Have you noticed any slightly less accurate fp scans?

4. Thanks!
[OnePlus 8 Guides, News, & Discussion] rekman:
Just as snappy as the tmobile oos
[OnePlus 8 Guides, News, & Discussion] succumbtothegreater:
Just want to report that I did the conversion yesterday. Initially, I tried to flash the fastboot ROM after doing MSM back to 10.5.7 and the updating to 10.5.10. Even after restoring my Modem I backed up before the fastboot flash, I had no signal.

So, I used MSM to go back to 10.5.7, from which I DID NOT update, unlocked the bootloader, flashed the fastboot ROM (10.5.11) and I'm all good, no signal issues and I didn't have to restore my Modem. 5G works and all, I'm not going to remove my SIM based on other comments in this thread, but just wanted to put that out there.
[OnePlus 8 Guides, News, & Discussion] iKevin:
Does your finger print scanner still work? Did you back up and restore your persist.img?
[OnePlus 8 Guides, News, & Discussion] succumbtothegreater:
Yes is does. No restore was required, but I did back it up if it was needed.
[OnePlus 8 Guides, News, & Discussion] Scott:
So just to clarify...

1. MSM Back to T-Mobile 10.5.7

2. Unlock bootloader

3. Flash fastboot 10.5.11

No issues? No fingerprint, connectivity, or other issues? Simple just like on T-Mo 6T?
[OnePlus 8 Guides, News, & Discussion] succumbtothegreater:
Yes, simple as that, that's exactly what worked for me. I decided to try it on a whim and it worked perfectly, no signal issues, fingerprint works, and everything else works, I've not noticed any issues. Don't know if I got lucky, but it worked for me.
[OnePlus 8 Guides, News, & Discussion] esjames:
Backup Persist, or your fingerprint reader will not work.
[OnePlus 8 Guides, News, & Discussion] parsa5:
Not true. You don't need to backup persist, but you should.
[OnePlus 8 Guides, News, & Discussion] knightsh:
I agree. I rooted and backed up mine just in case. But didn't need it. I tried going from T-Mobile 10.5.10 to the international equivalent but I lost signal. I tried everything in this thread but nothing worked. So I went back to 10.5.7, did not update, unlocked the bootloader again, flashed global 10.5.9 without wiping data, then updated and then locked bootloader. All is good in the world.
[OnePlus 8 Guides, News, & Discussion] Scott:
Nah, that's not luck. Its a damn good find! I was reading about persist.img and all these other issues with the conversion. None of this makes any sense to me.

Having made a few ROMS in my day led me to believe....

This was a simple mismatch of firmware vs software and or the critical partitions not being flashed properly although fastboot said they were.

And with that, you should not need to MSM all the way back to the shipping ROM to do this. You should only need to find the matching international firmware to your current T-mo build. In theory flash that over and it should work.

All in theory anyways.... Going to check my build and find the appropriate fastboot ROM and let you know for sure.

Oh that's a given! I don't want to chance screwing up an unlocked phone that I will have to replace with a freshly locked refurb!

Crosses fingers....

---------- Post added at 10:26 PM ---------- Previous post was at 10:25 PM ----------

Why did you lock the bootloader again?
[OnePlus 8 Guides, News, & Discussion] Scott:
Critical partition flashing....

Did anyone get these errors when converting?
[OnePlus 8 Guides, News, & Discussion] mimix2ppp:
helpppppppppppppppppppppp
[OnePlus 8 Guides, News, & Discussion] succumbtothegreater:
I got similar errors, not sure they were the exact same, after I did MSM back to stock and forgot to unlock the bootloader again after that, and tried flashing the fastboot ROM.
[OnePlus 8 Guides, News, & Discussion] knightsh:
Scott I relocked my bootloader for ease of use with banking apps, Google pay, etc. I really have no interest in the root scene anymore.
[OnePlus 8 Guides, News, & Discussion] rekman:
What was your relock method? I want to relock mine, but don't wanna mess it up and have to start way back at msm...
[OnePlus 8 Guides, News, & Discussion] parsa5:
Fastboot OEM lock. That's what I did anyway.
[OnePlus 8 Guides, News, & Discussion] teegraves58:
This didn't interfere with fingerprint scanner not working? From my understanding once you relock bootloader the fingerprint scanner doesn't work anymore.
[OnePlus 8 Guides, News, & Discussion] knightsh:
He's right. I just used Fastboot OEM lock. I've been nervous this whole time as well. But I'm still using my Pixel 2xl so I didn't have to worry much. Once you figure out how to use the various tools it gets more comfortable. I never lost fingerprint but I did make a backup just in case.
[OnePlus 8 Guides, News, & Discussion] Scott:
Yeah, I think it had to do with DM Verity and critical partitions. I dont know. I give up. I am waiting for someone to hack the MSM Tool that will allow us to flash the plain jane ROM for One Plus

Gotcha!
[OnePlus 8 Guides, News, & Discussion] vandizzam:
So did you covert? If you weren't able to I don't think I'll attempt yet
[OnePlus 8 Guides, News, & Discussion] Scott:
I didint have a whole lot of time so after that failed, I just MSM'ed back for now. I was hoping to get the new T-Mobile 5G update but that hasnt happened yet so I might give this another shot later today.
[OnePlus 8 Guides, News, & Discussion] Droidman61:
Weird I did exactly what you did above, and it flashed for 5 seconds then reverted back to my 10.5.17 Stock rom.:confused:

---------- Post added at 06:27 PM ---------- Previous post was at 06:10 PM ----------

How do you get to Fastboot d:confused: Is that different the just booting to Fastboot?

Sorry for the newb question.:good:

Thanks.
[OnePlus 8 Guides, News, & Discussion] gerguter:
Just want to say I just went through the whole process again and everything is working. Fingerprint and signal.
[OnePlus 8 Guides, News, & Discussion] Droidman61:
Well after trying 4 tries with 2 different software NO GO!!:( Oh well once things are a sure thing I will try again. This T-Mobile suck.:rolleyes:
[OnePlus 8 Guides, News, & Discussion] Scott:
Huh? What do you mean 2 different versions of software? Explain more and maybe we can help.

I have been waiting for the T-Mo 5G update. Looks like thats not going to happen for me so here goes....
[OnePlus 8 Guides, News, & Discussion] Scott:
All came out well as far as I can tell, 5G Icon, VoWiFi, Fingerprint. July Security Patch, so I must be on the latest international build which is newer than the build posted on the OnePlus site. Im happy with it. So nice to not see the stupid Magenta screen any more.

I realized what I did wrong the first time. At one point the phone will reboot into fastboot mode. I thought mine was stuck and tried to manually boot to fastboot from the OP boot-loader. When I did that it caused those partitions not to flash. I left it this time and it went right through.

[MENTION=4879334]matteosaeed[/MENTION], in the OP I would suggest listing the specific version of the fastboot ROM. It may help some people. The one that worked for me was 10.5.11-GLOBAL-OnePlus8Oxygen_15.O.20_OTA_020_all_2007160043_a37510de1b26-FASTBOOT.

Thanks for taking the time to put this together. Worked out great!
[OnePlus 8 Guides, News, & Discussion] Droidman61:
I tried the 10.5.10 & 10.5.11 Global and after following a post 1. I used MsmDownloadTool V4.0.exe to go back to 10.5.7 2. Then the phone locked, then I unlocked it. 2. I booted into fastbood d and then I double clicked all.bat and it started to flash and said "Error cant flash a bunch of files not located" So I had to start all over again to get back to stock T-Mobile.:(

Thanks for any help.:good:
[OnePlus 8 Guides, News, & Discussion] knightsh:
Just thought I'd throw it out there. After converting from T-Mobile to Global recently with the help of this thread, I jumped on the developer preview 3 this morning. Very simple install. Wi-Fi calling still works.
[OnePlus 8 Guides, News, & Discussion] gerguter:
You don't want fastboot d. Just use the advanced reboot menu in developer options and boot to bootloader and then run the flash all.
[OnePlus 8 Guides, News, & Discussion] Droidman61:
Sorry all I know is fastboot d and fastboot. How do you get to the advanced reboot menu? Thank you for the help.?
[OnePlus 8 Guides, News, & Discussion] teegraves58:
Hey all, so I got my device from T-Mobile to global, however I have been running into issues with texts/calls coming through. All will work fine, but randomly I'll just stop receiving texts and calls until I restart my phone. Then I'll be good for anywhere from a few hours to a day or two before it will do it again. Any help?
[OnePlus 8 Guides, News, & Discussion] parsa5:
What texting app are you using?
[OnePlus 8 Guides, News, & Discussion] teegraves58:
Just Google messages. It's so odd. Like I said, all will be good. But then I'll randomly go to text someone and it won't work. So then I'll restart my phone and I'll get texts pouring in that I've missed from however long until I noticed. (usually no more than 30-45 minutes but you get the gist.)
[OnePlus 8 Guides, News, & Discussion] NikoZBK:
Sometimes I also can't send text messages, I have to toggle airplane mode. Something is not right
[OnePlus 8 Guides, News, & Discussion] teegraves58:
Makes me feel better to know I am not the only one with this issue lol. I have flashed the European version just to see if it makes any difference. Fingers crossed so far so good, but only looking at about 4-5 hours runtime so far.

---------- Post added at 06:08 AM ---------- Previous post was at 06:07 AM ----------

Lol speak of the devil, literally as soon as I say that it stops working. Well! Back to the drawing board I suppose.
[OnePlus 8 Guides, News, & Discussion] Droidman61:
We'll I finally got Global to work on it last night.:cool: Crossing my fingers everything stays the way it is.;)
[OnePlus 8 Guides, News, & Discussion] Scott:
I have not used text or mms yet. Only been on since last night. I will play around today using my google voice number if I have time.

But so far I am pretty happy with the over all conversion.

Good deal!
[OnePlus 8 Guides, News, & Discussion] Droidman61:
Thanks for all that helped me, simple once I unziped it LOL :)
[OnePlus 8 Guides, News, & Discussion] knightsh:
Anyone having problems with their messages app on T-Mobile, check your settings. I was missing a few things under the APN. So I set up a new one and copied everything from my Pixel 2 XL that's been on T-Mobile. Once I enabled it my chat features started working on my messaging app. Just something to try
[OnePlus 8 Guides, News, & Discussion] rekman:
Has anybody successfully taken the modem from 10.5.17 T-Mobile and flashed it to the latest global? I assume it was the modem that was pertinent to the 5g SA update
[OnePlus 8 Guides, News, & Discussion] teegraves58:
So far I think I've narrowed it down to WiFi calling. I don't know much about the technicalities, but I think when you disconnect from WiFi/reconnect the phone has a tough time transferring from Vo-Wifi to VoLte or vice versa. Turning off WiFi calling has fixed this issue I believe. Going on 24 hours and no issues so we will see.
[OnePlus 8 Guides, News, & Discussion] iKevin:
Finally got the global working

1. MSM Back to T-Mobile 10.5.7

2. Upgrade to T-Mobile 10.5.10

3. Unlock bootloader

4. Flash fastboot 10.5.11

5. Restore persist.img for fingerprint

Need to do steps # 2, 5 otherwise no signal and no finger print
[OnePlus 8 Guides, News, & Discussion] Temujin503:
Does anyone know if you can use the Android 11 developer preview on a T-Mobile version that's been converted to global firmware?
[OnePlus 8 Guides, News, & Discussion] iKevin:
I think someone did it already.
[OnePlus 8 Guides, News, & Discussion] joe1gun:
Locked and loaded preview on T-Mobile converted to global. All works fine!
[OnePlus 8 Guides, News, & Discussion] knightsh:
Same here. Installed the beta same morning it dropped. Running great!