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.
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
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!
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!
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.
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.
Do you have any knowledge regarding partitions ? I have a speculation that after successfully installing global firmware through modified msm may be AVB (android varified boot) is the issue that doesn't let it boot.
Do you have any knowledge regarding partitions ? I have a speculation that after successfully installing global firmware through modified msm may be AVB (android varified boot) is the issue that doesn't let it boot.
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
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
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.
Disclaimer While I will assist with any issues resulting from this guide, I disclaim all responsibility and cannot be held accountable for any consequences caused by the use or misuse of this tool or process. This method also will wipe your...
Disclaimer While I will assist with any issues resulting from this guide, I disclaim all responsibility and cannot be held accountable for any consequences caused by the use or misuse of this tool or process. This method also will wipe your...
***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
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.
---------------
---------
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.
*** 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"
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.
***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
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.
---------------
---------
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.
*** 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"
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
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 ?
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"
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.
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