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[Guide] Convert to Global [WIP]

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Apr 28, 2010
19
10
It just won't work. I've done all of the above, and even had IMEI2 changed. Still could never get the second SIM slot to activate and would just show no signal.
 
Sep 22, 2021
18
1
Hi, I'm new to all this so I need some help and clarification.
Does backing up "Modem" means backing up "EFS"?
EFS and Persist both can be backed up by using TWRP, right?
Also, do I need to root my device after unlocking the bootloader? And what if I don't want root after converting successfully to Global?
I will be using TOOL ALL IN ONE to Unlock the Bootloader and then rooting (if it's needed).
Device is OnePlus 8 IN2017 currently on 11.0.4.6.IN55CB. Do I need to downgrade from this for conversion to work?
Also, currently I'm not using T Mobile SIM but a Telenor SIM in Pakistan. So, if conversion happens successfully, will I still be able to use my Telenor SIM or the conversion will cause any issue?
Thanks in advance
there is no issue. you can use Telenor sim. first downgrade to andriod 10. same version of tmobile rom and then download same version of globel andriod then and flash it. I am from Pakistan and successfully covert it to globel.
 

newellj79

Senior Member
Jan 2, 2011
2,378
298
OnePlus 8
I've read the entire thread. I can't seem to find a solid answer on if 5G still works after the conversion. I'm currently on the tmobile network, android 11, thinking I want to do this.
 

kolt54321

New member
Nov 19, 2021
3
0
Looks like chances are dicey. New here - have my OP8 on A10 but SIM card (T-Mobile) is coming next week. Can anyone affirm if A11 is forced, requiring you to flash to global like the above to keep it on A10?
 

Bowery_King

Member
Oct 6, 2021
9
2
22
Lahore, Pakistan
Looks like chances are dicey. New here - have my OP8 on A10 but SIM card (T-Mobile) is coming next week. Can anyone affirm if A11 is forced, requiring you to flash to global like the above to keep it on A10?
Keep it on A10 since TMO MSMTool is available for A10 (10.5.6 if I'm correct) not A11. I myself had to downgrade from TMO A11 to TMO A10 using MSM and then to EU or Global.
 

lukhach0

Member
Mar 27, 2016
5
0
Hi, i'm newbie here, what happen when i successful convert my tmo ver to global and then click on OTA update. It going back to tmo or get global update. Thank
 

poisson_pmf

Member
Dec 21, 2021
5
3
Hello Community,

New to the world of hacking mobile devices, so any help or direction is appreciated.

The step by step directions are clear. But I want to bypass the MSM tool, because I do not have easy access to a Windows computer (am a Linux shop, with Macs on the side). My TMO devise is current with A11 December patch.

So, if I fastboot flush a global ROM

1) with an earlier version A11, say OOS 15.0.30, from Oct 2020
or
2) with the most recent A11 (OOS 15.0.40?)

what are my chances of succeeding?
 

Bowery_King

Member
Oct 6, 2021
9
2
22
Lahore, Pakistan
Hello Community,

New to the world of hacking mobile devices, so any help or direction is appreciated.

The step by step directions are clear. But I want to bypass the MSM tool, because I do not have easy access to a Windows computer (am a Linux shop, with Macs on the side). My TMO devise is current with A11 December patch.

So, if I fastboot flush a global ROM

1) with an earlier version A11, say OOS 15.0.30, from Oct 2020
or
2) with the most recent A11 (OOS 15.0.40?)

what are my chances of succeeding?
You need to downgrade to TMO OOS 10 to convert via MSM since MSM Tool is available for OOS 10
 

Bowery_King

Member
Oct 6, 2021
9
2
22
Lahore, Pakistan
Hello Community,

New to the world of hacking mobile devices, so any help or direction is appreciated.

The step by step directions are clear. But I want to bypass the MSM tool, because I do not have easy access to a Windows computer (am a Linux shop, with Macs on the side). My TMO devise is current with A11 December patch.

So, if I fastboot flush a global ROM

1) with an earlier version A11, say OOS 15.0.30, from Oct 2020
or
2) with the most recent A11 (OOS 15.0.40?)

what are my chances of succeeding?
Check Post #657. Those are the steps that I followed and was successful.
 

poisson_pmf

Member
Dec 21, 2021
5
3
Check Post #657. Those are the steps that I followed and was successful.

Thanks BK.

Yes the same steps in #657 is also described, in different words, in #577 and #593. So I take it that it is the tested and proven method to go with.

But that requires the use of MSM tool, which is Windows only. It is a problem to me as I do not have Windows machine, so I want to skip that part. That means flushing Global rom directly on top latest version Tmo phone.

The question I guess is if the MSM tool is doing some special preparation in addition to downgrading to A10. Or if A10 Tmo rom allows flushing whereas A11 does not.
 

Bowery_King

Member
Oct 6, 2021
9
2
22
Lahore, Pakistan
Thanks BK.

Yes the same steps in #657 is also described, in different words, in #577 and #593. So I take it that it is the tested and proven method to go with.

But that requires the use of MSM tool, which is Windows only. It is a problem to me as I do not have Windows machine, so I want to skip that part. That means flushing Global rom directly on top latest version Tmo phone.

The question I guess is if the MSM tool is doing some special preparation in addition to downgrading to A10. Or if A10 Tmo rom allows flushing whereas A11 does not.
If TMO allows downgrading to A10 then go ahead with it as MSM is just a tool to unbrick the phone. As far as I know, users cannot flash ROMs in TMO as it doesn't have the option of Local Update that is available in Global/EU OOS.
 

poisson_pmf

Member
Dec 21, 2021
5
3
I am going to answer my own question.

Turns out that you cannot fastboot flash an OP8-TMO if it is on Android 11. Fastboot gave me 'critical partition not unlocked' error for almost all img files I attempted to flash. I suspect A11 changed the file system structure substantially.

So I bit the bullet and MSM'ed to 10.5.7 TMO rom, then flashed 10.5.7 global successfully ending in 'Profit', as one post in this thread elegantly stated. next, I OTA'ed to latest A11 without any problems. All seems to be working fine, including a bonus 2nd sim device.

Hope this helps someone save some time and energy.
 
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poisson_pmf

Member
Dec 21, 2021
5
3
hey, folks!

been awhile since my last post (2013 i believe) now I'm just revisiting my favorite site to convert my T-Mobile Op8 to global ROM.

i cant remember when i last tinkered around with flashing and stuff, but i had to, the T-Mobile glaring pink bootscreen is annoying and mainly i just need to get the global ROM for faster support etc. (you know why)

anyways, ive managed to flash successfully on my first try (pure luck). I was on the latest A11 updates, i wont get into details but here are the simplified steps:

  1. MSM to TMO 10.5.7
  2. Unlock bootloader (you'll need the key 'duh)
  3. Flash to 10.5.7 international ROM using flash-all command
  4. Reset to factory settings
  5. Update OTA to the latest (updated to A11 latest stable build)
  6. Relock bootloader
  7. Profit
Note: After flashing the international ROM, my phone couldnt get any internet access (calls are still possible). But this can be fixed by deleting all the APN, and then reset the APN settings to default and leave it for a while, it will connect eventually.

I'm not interested in rooting and I know what i can get with it, my circumstances had changed and then some, i just need my device to work and thats why its not rooted and my bootloader was re-locked.

Happy flashing, cheers


That is the way, if you want to end up in profit 👾.

I attempted to bypass MSM and fastboot-flash an OP8-Tmo in A11 starting in step 3. It failed, complaining that critical partition is locked. Bit the bullet, started from Step 1 above and success (and profit!) I think A11 is the culprit here, if my Tmo had been on A10, shortcut might have worked.

Cheers
 

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  • 1
    I am going to answer my own question.

    Turns out that you cannot fastboot flash an OP8-TMO if it is on Android 11. Fastboot gave me 'critical partition not unlocked' error for almost all img files I attempted to flash. I suspect A11 changed the file system structure substantially.

    So I bit the bullet and MSM'ed to 10.5.7 TMO rom, then flashed 10.5.7 global successfully ending in 'Profit', as one post in this thread elegantly stated. next, I OTA'ed to latest A11 without any problems. All seems to be working fine, including a bonus 2nd sim device.

    Hope this helps someone save some time and energy.
    1
    I had to do a clean install and used MSM tool Oxygen OS 10.5.22 IN55CB. Everytime i try to flash global it just would not read sim card on international rom and every so often like 10 minutes, the device would reboot itself. I have tried oos 10.5.7 fastboot and above and none seems to work. i have tried the 10.5.2 and they wont allow critical partitions. both eu and global. anyone know how to fix this?

    much thanks
    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.
    1
    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.
    nice, glad it works on yours. my purpose was to flash a custom rom but now i figured it out. i just update the latest tmobile then just used payload dumper. first time i tried doing this on tmobile rom and had errors but i guess 2nd times the charm?
  • 13
    *** 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.