[Guide] Convert to Global [WIP]

Search This thread
I recommend using global firmware. If you simply wanted to flash a custom ROM, all of this craziness is unnecessary. You may simply flash global firmware with fastboot.
see thats the problem, when i did, i lose sim functionality and would say no sim card installed. so i just update to the latest tmobile firmware and just use payload dumper and rominstaller.bat or install a custom recovery
 
You said that you had problems with a custom ROM at first. I did too, so I'm curious as to the specifics. It seemed like the phone was quite unhappy being an instantnoodlet when the ROM was for instantnoodle.

Is that what ur talking about?
no my problem was installing the custom rom and it says "target for onepolus 8 but specifically for instantnoodle" on custom recovery but i fixed it using payload dumper and rominstaller.bat
 

Scout12345

Member
Jan 27, 2018
8
3
That's odd--I used your guide to flash mine, and it worked perfectly lol.

I've done it several times. Last time, I think I used 10.5.7 TMobile (?), then 10.something via fastboot, then I upgraded using the ROM's updater to newest international. Works flawlessly.
I just asked a few questions about your method on other thread, and then saw your subsequent posts in that thread. You originally indicated that you flashed Global and then flashed EU locally (in order to be able to then re-lock the bootloader I believe). Later you said you flashed Global, then ran OTA updates, but didn't mention installing the EU version at the end in order to re-lock. Can you clarify that also? Thanks for your help!
 

FoxyDrew

Senior Member
Aug 18, 2014
1,189
492
East Taunton
I just asked a few questions about your method on other thread, and then saw your subsequent posts in that thread. You originally indicated that you flashed Global and then flashed EU locally (in order to be able to then re-lock the bootloader I believe). Later you said you flashed Global, then ran OTA updates, but didn't mention installing the EU version at the end in order to re-lock. Can you clarify that also? Thanks for your help!
You don't need to flash EU version to lock the bootloader. You can relock on global just fine
 
  • Like
Reactions: Scout12345

umairkhalid415

Senior Member
Oct 2, 2013
77
10
25
OnePlus 8
OnePlus 9
there will never be a fix until someone makes the modified msm tool
What things to be modified in msm tool to flash it on T-Mobile variant?
I have modified msm tool of eu and global to run it on T-Mobile variant and flashed successfully without param preload error or any other error but it doesn't boot just directly goes to the fastboot no crashdump error nothing.
 

umairkhalid415

Senior Member
Oct 2, 2013
77
10
25
OnePlus 8
OnePlus 9
there will never be a fix until someone makes the modified msm tool
If anyone wants to contribute to the work it will be very appreciated.
And one more thing we can lock bootloader even on android 10 global.
Downgrade to android 10 TMO using msm .
Install global android 10 fastboot rom.
Then reboot to fastboot/bootloader
Fastboot flash vbmeta vbmeta.img
Fastboot flash vbmeta_system vbmeta_system.img
Now relock bootloader no crashdump no error
 
What things to be modified in msm tool to flash it on T-Mobile variant?
I have modified msm tool of eu and global to run it on T-Mobile variant and flashed successfully without param preload error or any other error but it doesn't boot just directly goes to the fastboot no crashdump error nothing.
yoooooooooooo nice
-make a thread to get more ppl to see it and that would help u in the future
 

febo77

Member
Apr 16, 2011
12
4
If anyone wants to contribute to the work it will be very appreciated.
And one more thing we can lock bootloader even on android 10 global.
Downgrade to android 10 TMO using msm .
Install global android 10 fastboot rom.
Then reboot to fastboot/bootloader
Fastboot flash vbmeta vbmeta.img
Fastboot flash vbmeta_system vbmeta_system.img
Now relock bootloader no crashdump no error
Where i get vbmeta.img?
 

Taimur1477

Member
Oct 25, 2021
9
0
OnePlus 8
If anyone wants to contribute to the work it will be very appreciated.
And one more thing we can lock bootloader even on android 10 global.
Downgrade to android 10 TMO using msm .
Install global android 10 fastboot rom.
Then reboot to fastboot/bootloader
Fastboot flash vbmeta vbmeta.img
Fastboot flash vbmeta_system vbmeta_system.img
Now relock bootloader no crashdump no error
Umair bro does your method enables dual sim?
If doesn't then everybody knows how to rebrand without error.
1. Unlock bootloader
2. Msm TMobile android 10.5.7
3. Flash global android 10.5.7
4. Update to latest then relock bootloader
These steps works fine on TMobile op8 in2017 without any error.
Just dual sim doesn't work, only single sim works
 

dlhxr

Senior Member
May 26, 2011
544
508
New York City
OnePlus One
OnePlus 3
What things to be modified in msm tool to flash it on T-Mobile variant?
I have modified msm tool of eu and global to run it on T-Mobile variant and flashed successfully without param preload error or any other error but it doesn't boot just directly goes to the fastboot no crashdump error nothing.
Hey, I am interested in this. See Verizon variant can use dual sims after unlock. Do you have any updates on modified msm tool?

 
  • Like
Reactions: gottamakehermine
Aug 31, 2015
14
0
Hey, I am interested in this. See Verizon variant can use dual sims after unlock. Do you have any updates on modified msm tool?

I'm also interested in this, have unlocked bootloader Verizon model.
 

clisays

Senior Member
Apr 3, 2022
54
2
*** Use this at your very own risk.

***Backup your persist.img. There is a guide to fix it if needed.

*** Backup your working modem. Sometimes it is as simple as restoring it if you lose signal.

*** When flashing, you must understand the difference between fastboot and fastbootd to avoid flashing errors.

*** Backup your files in a safe place.

*** Some users are reporting that the whole thing is not working and going on a blame streak. So if you're not quite ready, please don't attempt this.




Basic Instructions: "I will test again since some users are losing signal after flashing". There is a debate whether msm and update the tmobile firmware, or flash the global. Again this is a WIP.

MSM. Here is the thread.
Unlock bootloader or re-unlock bootloader ... Enable OEM Unlock in developer options. flash token.
Fastboot
Code:
fastboot flash cust-unlock <unlock_token.bin>
Code:
fastboot oem unlock
and now your bootloader is unlocked.

Here is the t-mobile article for the 6t. same instructions for the 8 if you're new to this.
NEXT:

Link to fastboot thread
https://forum.xda-developers.com/oneplus-8/how-to/rom-stock-fastboot-roms-oneplus-8-t4084629

Download the global fastboot rom from here.

Unzip and flash all.

Link to twrp thread:
https://forum.xda-developers.com/oneplus-8/development/recovery-unofficial-twrp-oneplus-8-t4101315

If you want to root.
Boot into twrp or flash the twrp installer. TWRP 3.3.1-10 Test by mauronofrio and or TWRP 3.3.1-10 Test Installer by mauronofrio "newer ones may work"

After booting, you can flash magisk with-in twrp and you're rooted.

I have used oxygen updater to update the firmware while rooted. After the local install, open magisk and flash on the inactive slot.
---------------

If you ever want to revert, use the msm tool. Here is the thread.
https://forum.xda-developers.com/oneplus-8/how-to/op8-unbrick-tool-to-restore-device-to-t4093043

---------
Old information from the old thread is below, if you want to use it only for reference or for backing up the FP persist

---------------

Old Instructions
Here we go .....
This is fairly new and hasn't been tested so, proceed with caution. There are more knowledgable people here. This was just tested quick and it worked.

Requirements
1-Be on T-mobile firmware and update to the latest version. If you are bootloader unlocked, you mean not be able to take OTA's and you may need to reflash with MSM and update, then unlock the bootloader again. Thread Thanks @Some_Random_Username

2 - Unlock your bootloader.

3- --! IMPORTANT: Make a TWRP backup of your MODEM because we'll restore that later, why? because t-mobile sim doesn't work on the Global Modem. You can also back everything up in TWRP just in case.
If you have OTG, make the backup there so it is safe. You can restore the modem through TWRP with the OTG.

4-Backup your persist. Otherwise you may lose the fingerprint.
You'll need root.
Code:
adb shell
HTML:
su
Code:
dd if=/dev/block/bootdevice/by-name/persist of=/sdcard/persist.img
Then
Code:
adb pull sdcard/persist.img
Then copy it from from Sdcard to a safe place



*** You may lose signal again if you update the global version. It is a WIP but keep your modem backed up!

With all the above:
It is simple. Download the global firmware and flash it through fastboot. Here is the thread
.. I tested with "10.5.5-GLOBAL-OnePlus8Oxygen_15.O.14" Thanks @mauronofrio

  • Reboot to fastboot
  • Unzip and flash-all
  • It will reboot to the global firmware. "Now you won't get cellphone signal"
  • Skip the setup and reboot to fastboot.
  • reboot to twrp, do not flash it.
    Code:
    fastboot boot twrp.img
    link to twrp thread. . I used TWRP 3.3.1-2 Test by @mauronofrio
  • plug in the OTG or locate the backup and Restore the Modem" to get signal
  • Reboot and you'll have signal.

To root. you can flash the patched boot located in the sourceforge folder " Patched-Stock-Boot" on this thread
Code:
fastboot flash boot filename.img
You can also flash magisk in twrp. I prefer the patched boot.

Bonus: I am running the Nolimit magisk rom Thanks @xXx
https://forum.xda-developers.com/on...gisk-rom-xxx-nolimits-11-0-speed-ram-t4088609

Thanks @Some_Ghost for testing.
Can my verizon customized version swipe modem.img to fix the missing signal problem? I can unlock it and browse the global and European versions, but there is no signal.
 

Top Liked Posts

  • There are no posts matching your filters.
  • 14
    *** Use this at your very own risk.

    ***Backup your persist.img. There is a guide to fix it if needed.

    *** Backup your working modem. Sometimes it is as simple as restoring it if you lose signal.

    *** When flashing, you must understand the difference between fastboot and fastbootd to avoid flashing errors.

    *** Backup your files in a safe place.

    *** Some users are reporting that the whole thing is not working and going on a blame streak. So if you're not quite ready, please don't attempt this.




    Basic Instructions: "I will test again since some users are losing signal after flashing". There is a debate whether msm and update the tmobile firmware, or flash the global. Again this is a WIP.

    MSM. Here is the thread.
    Unlock bootloader or re-unlock bootloader ... Enable OEM Unlock in developer options. flash token.
    Fastboot
    Code:
    fastboot flash cust-unlock <unlock_token.bin>
    Code:
    fastboot oem unlock
    and now your bootloader is unlocked.

    Here is the t-mobile article for the 6t. same instructions for the 8 if you're new to this.

    NEXT:

    Link to fastboot thread
    https://forum.xda-developers.com/oneplus-8/how-to/rom-stock-fastboot-roms-oneplus-8-t4084629

    Download the global fastboot rom from here.

    Unzip and flash all.

    Link to twrp thread:
    https://forum.xda-developers.com/oneplus-8/development/recovery-unofficial-twrp-oneplus-8-t4101315

    If you want to root.
    Boot into twrp or flash the twrp installer. TWRP 3.3.1-10 Test by mauronofrio and or TWRP 3.3.1-10 Test Installer by mauronofrio "newer ones may work"

    After booting, you can flash magisk with-in twrp and you're rooted.

    I have used oxygen updater to update the firmware while rooted. After the local install, open magisk and flash on the inactive slot.
    ---------------

    If you ever want to revert, use the msm tool. Here is the thread.
    https://forum.xda-developers.com/oneplus-8/how-to/op8-unbrick-tool-to-restore-device-to-t4093043

    ---------
    Old information from the old thread is below, if you want to use it only for reference or for backing up the FP persist

    ---------------

    Old Instructions
    Here we go .....
    This is fairly new and hasn't been tested so, proceed with caution. There are more knowledgable people here. This was just tested quick and it worked.

    Requirements
    1-Be on T-mobile firmware and update to the latest version. If you are bootloader unlocked, you mean not be able to take OTA's and you may need to reflash with MSM and update, then unlock the bootloader again. Thread Thanks @Some_Random_Username

    2 - Unlock your bootloader.

    3- --! IMPORTANT: Make a TWRP backup of your MODEM because we'll restore that later, why? because t-mobile sim doesn't work on the Global Modem. You can also back everything up in TWRP just in case.
    If you have OTG, make the backup there so it is safe. You can restore the modem through TWRP with the OTG.

    4-Backup your persist. Otherwise you may lose the fingerprint.
    You'll need root.
    Code:
    adb shell
    HTML:
    su
    Code:
    dd if=/dev/block/bootdevice/by-name/persist of=/sdcard/persist.img
    Then
    Code:
    adb pull sdcard/persist.img
    Then copy it from from Sdcard to a safe place



    *** You may lose signal again if you update the global version. It is a WIP but keep your modem backed up!

    With all the above:
    It is simple. Download the global firmware and flash it through fastboot. Here is the thread
    .. I tested with "10.5.5-GLOBAL-OnePlus8Oxygen_15.O.14" Thanks @mauronofrio

    • Reboot to fastboot
    • Unzip and flash-all
    • It will reboot to the global firmware. "Now you won't get cellphone signal"
    • Skip the setup and reboot to fastboot.
    • reboot to twrp, do not flash it.
      Code:
      fastboot boot twrp.img
      link to twrp thread. . I used TWRP 3.3.1-2 Test by @mauronofrio
    • plug in the OTG or locate the backup and Restore the Modem" to get signal
    • Reboot and you'll have signal.

    To root. you can flash the patched boot located in the sourceforge folder " Patched-Stock-Boot" on this thread
    Code:
    fastboot flash boot filename.img
    You can also flash magisk in twrp. I prefer the patched boot.

    Bonus: I am running the Nolimit magisk rom Thanks @xXx
    https://forum.xda-developers.com/on...gisk-rom-xxx-nolimits-11-0-speed-ram-t4088609

    Thanks @Some_Ghost for testing.
    2
    I don't think that's correct. The OP stated differently about 10 posts ago. MSM, then unlock bootloader, then flash all, then update. Pretty sure the OP is correct
    You are correct msm. Unlock bl. Flash all. Update. But I'm here to tell you guys I took the bootloader lock plunge and came out just fine??? as you can see I'm on T-Mobile with signal and a locked bootloader which you can tell by the L1 widevine cert I have ?
    2
    @joemossjr :p :p :p

    Thats what I'm saying, this is to flash rom, it not necessarily converting the phone to a global phone since it still need Tmobile Modem bin file in order to be function as a phone. If you take the phone outside the U.S it questionable if it works, that is why I say this is only for Dev Rom and in this case stock global rom but it is not a global phone.

    Well check @ecompton59 's response. He was able to get things working.

    The modem does work, just there is an issue with the fastboot flashing the modems. The TWRP restore of the modem is to get cell signal right away.

    Here is what I did:
    • After I did what is in the first post in the thread:
    • I used oxygen updater to download the EU update and flashed it via "Local Upgrade" @Some_Ghost tested that as well.
    • There is signal. I believe that it may have flashed the modem "maybe", unlike fastboot.
    • While I was on the EU version, I downloaded the update for the global, and did a "Local Upgrade" again, and got signal.
    • I did all of this with Magisk being installed and after each "local upgrade, before reboot" I install Magisk on the "inactive slot, ota".

    Technically speaking and don't quote me 100%, the first flash to the global is what gives issues with the sim, but that's the way to get the ability to do "local upgrade" because it is disabled on the t-mobile firmware.

    Theoretically and I haven't tested.
    Unlock bootloader >> Flash global "won't flash everything properly" = no signal
    Global to another global or EU update >> will flash the modem >> signal will work "as it will properly flash everything"
    2
    im putting TMobile modem.img for fastboot the one in op fastboot flash modem _____.img drag file( _____here) heres mega link for modem T-Mobile modem.img
    https://mega.nz/file/Xh8jgKRQ#mUAEbu1eKxj94ysfyTpOt1f_AoSd1Nv7SF_4NIObxX4
    2
    again, this does not make it a global sim unlock phone, you are flashing a previous Tmobile Modem on top of a Global rom.
    It at least we can run different firmwares on T-Mobile. You could try the global msm on T-Mobile and report back. As being sim unlocked depends on the bands enabled in other countries but should work with any sim.