[GUIDE] Complete Step-by-Step Convert T-Mobile to Global (or other) firmware

[keesh_x]

Dual SIM is supported for Global ROM and EU ( I think, not sure) but definitely not Indian ROM.

I used USB 2.0 all across and haven't tried 3.0 . After Part 2 , i did not see Dual SIM enabled , I had to get the Global ROM as indicated below to actually see the Dual SIM.

ONE MORE THING - I read somewhere that you need the Dual SIM Tray with two SIM cards in it when you are updating it to Global ROM to get the two IMEIs show up.

In Part 3 , step 4 I used this Downgrade ROM for Global from this thread

[OnePlus 8][ROM][OTA][Oxygen OS] Repo of Oxygen OS Builds

As OnePlus doesn't always provide download links for all of their OxygenOS ROMs & OTA update zips, we've created an index to put the links in one post so that they're easy to find. Note: This is not a support thread for issues you may have with...

forum.xda-developers.com

The actual zip is

https://oxygenos.oneplus.net/OnePlus8Oxygen_15.O.40_OTA_0400_all_2110102322_downgrade.zip

Check the attached screenshot.

Then I let the system update itself by going to the settings and checking for updates, i think the next upgrade enabled dual sim for me. I did this all the way to Android 13 and dual sim was retained.

Can you please clarify something Abt android 13, u updated it to android 13 and it still had dual sims but this guide says only oos 11 is supported, how did u manage to do it for oos 13 ?

And secondly does pixel exp or any other custom rom retain dual sim too?

 

[TechForEver]

Nope I haven't gotten it yet, altho upgrading to oxygen os 12 removed the dual sim somehow, dialer says null on second imei (but it does show 2 sim option in the notif bar), does it happen with u too or u don't have any second IMEI altogether?

What?!
You said you have converted to global and made factory reset then dual sim become enable! and you waiting to dual sim tray ?

how now you saying you lost dual sim ? I am confusing .!

 

[keesh_x]

What?!
You said you have converted to global and made factory reset then dual sim become enable! and you waiting to dual sim tray ?

how now you saying you lost dual sim ? I am confusing .!

My bad if I misinterpreted.

I do have dual sim shown up above in the status bar above but when I type it in dialer, it only shows IMEI one and on IMEI two it shows "null", I haven't received sim tray(when I do I'll update) so I am not sure if this "null" is just written and that dual sim will work regardless of this null thing.

To summarise, on oos 11 I could see both imeis in dialer but in oos 12 I see null on second IMEI, dual sim functionality is yet to be tested.

I have attached the screenshot below

 

[TechForEver]

My bad if I misinterpreted.

I do have dual sim shown up above in the status bar above but when I type it in dialer, it only shows IMEI one and on IMEI two it shows "null", I haven't received sim tray(when I do I'll update) so I am not sure if this "null" is just written and that dual sim will work regardless of this null thing.

To summarise, on oos 11 I could see both imeis in dialer but in oos 12 I see null on second IMEI, dual sim functionality is yet to be tested.

I have attached the screenshot below

This is absolutely what with me.

But have tried (file script) what i have share it's link in this thread. I didn't tryed it.
can you try it and tell . It required you to flassh custom recovery first and then flash script via custom recovery.

 

[keesh_x]

This is absolutely what with me.

But have tried (file script) what i have share it's link in this thread. I didn't tryed it.
can you try it and tell . It required you to flassh custom recovery first and then flash script via custom recovery.

Well I am planning on doing pixel experience some times later, I'll try then. I can't give an ETA for that tho. It might take some time or maybe in a week.

 

[keesh_x]

This is absolutely what with me.

But have tried (file script) what i have share it's link in this thread. I didn't tryed it.
can you try it and tell . It required you to flassh custom recovery first and then flash script via custom recovery.

But this is just my opinion, that this null might be there from software perspective and that dual sim can actually work. Have u tried the dual sim tray and actually inserted two sims?

 

[TechForEver]

But this is just my opinion, that this null might be there from software perspective and that dual sim can actually work. Have u tried the dual sim tray and actually inserted two sims?

No i haven't dual SIM tray now

Well I am planning on doing pixel experience some times later, I'll try then. I can't give an ETA for that tho. It might take some time or maybe in a week.

Good luck
Take your time and trying then tell

 

[keesh_x]

No i haven't dual SIM tray now

Good luck
Take your time and trying then tell

Just to assure ur self u can go to settings and disable sim in network section then u can see two sims in status bar.

Try ordering the dual sim tray and check if it works

 

[keesh_x]

This is absolutely what with me.

But have tried (file script) what i have share it's link in this thread. I didn't tryed it.
can you try it and tell . It required you to flassh custom recovery first and then flash script via custom recovery.

I did lineage os and only have lineage recovery in it (my model is back to in2017 now and with single sim, no two imeis), i am not too comfortable with twrp, does this script enable dual sims? I dont think i might be able to run any random script

 

[iMogul]

Can you please clarify something Abt android 13, u updated it to android 13 and it still had dual sims but this guide says only oos 11 is supported, how did u manage to do it for oos 13 ?

And secondly does pixel exp or any other custom rom retain dual sim too?

The Dual SIM does not work for the Indian firmware for Android 12/13 , for GLOBAL it works. Check Part 3 for the text in yellow.

Part 3: Converting to other regions (e.g., Global, EU, Indian) and lock Bootloader​

*** Cannot lock bootloader after flashing Fastboot ROM. Will corrupt device ​

*** As of right now, Dual SIM doesn't work on OOS12/13 Indian Firmware​

 

[iMogul]

No absolutely no
Guide saying (you can) flash (any) region rom (whatever) you want via local uodate after fastboot rom

He just said (indian) Rom oos 12/13 dial sim not work

For me it did not work when I took the latest Global ROM. After fastboot, I did the local update with the Global downgrade firmware I listed with the zip file in my previous post and then stepped up all the way to Android 13 by going into the Phone's System Update and checking for each update (these were the OTA updates).

If you are still getting the null for the 2nd IMEI , i advise repeat the steps with a dual SIM Tray and two working SIMS in it.

 

[jasonring]

i recently updated my tmo oneplus 8 to oos 13 and the phone can no longer register to verizon network.

i am thinking to convert it to global and dual sim.

shuld i do these steps instead?

1. unlock bootliader with token i got from oneplus.
2. flush global rom oos 13.
3. run dual sim script mentioned in one of the thread
4. relock bootloader.

can someone help to review these steps and let me know if it make sense


or i suould just follow the guide. Thank your .

 

[keesh_x]

i recently updated my tmo oneplus 8 to oos 13 and the phone can no longer register to verizon network.

i am thinking to convert it to global and dual sim.

shuld i do these steps instead?

1. unlock bootliader with token i got from oneplus.
2. flush global rom oos 13.
3. run dual sim script mentioned in one of the thread
4. relock bootloader.

can someone help to review these steps and let me know if it make sense


or i suould just follow the guide. Thank your .

Follow the guide as it is

 

[iMogul]

i recently updated my tmo oneplus 8 to oos 13 and the phone can no longer register to verizon network.

i am thinking to convert it to global and dual sim.

shuld i do these steps instead?

1. unlock bootliader with token i got from oneplus.
2. flush global rom oos 13.
3. run dual sim script mentioned in one of the thread
4. relock bootloader.

can someone help to review these steps and let me know if it make sense


or i suould just follow the guide. Thank your .

There is an unlock.ops somewhere few pages back that is meant for Verizon, did you try to use that or the Tmobile unlock.ops attached to the Guide ?
The unlock.ops file was meant to unlock the bootloader as well without getting the unlock token from OnePlus. Some people had luck with and without it so you can try both steps.

 

[keesh_x]

Hey there

This

Firmware Flasher script to enable dual SIM in our OnePlus 8 TMobile after converted and (other devices)​

Download file for OnePlus 8 flash via custom recovery​

https://github.com/Wishmasterflo/Firmware_flasher

This is just a flasher script right, I read the source code. It's just like adb side loading the firmware, how exactly will this enable dual sims? Have u gathered some info abt it?

 

[TechForEver]

This is just a flasher script right, I read the source code. It's just like adb side loading the firmware, how exactly will this enable dual sims? Have u gathered some info abt it?

IDK one guy in Nameless Rom (aosp) in telegram group told me
You can ask him there but i think it's working. I didn't yet trying it because i don't want install custom recovery/Roms (now) maybe later.
Please try it and told.

Florian in Nameless-AOSP | OnePlus Hub

do what?? Dont you have dualsim working now? Are you on OOS13? Then flashing OOS13 firmware should get it to work. https://github.com/Wishmasterflo/Firmware_flasher

t.me

 

[keesh_x]

IDK one guy in nampless Rom (aosp) in telegram group told me
You can ask him there but i think it's working. I didn't yet trying it because i don't want install custom recovery/Roms

Florian in Nameless-AOSP | OnePlus Hub

do what?? Dont you have dualsim working now? Are you on OOS13? Then flashing OOS13 firmware should get it to work. https://github.com/Wishmasterflo/Firmware_flasher

t.me

Okay let me gather info, thank you

 

[TechForEver]

Okay let me gather info, thank you

You can try this
(Need Root)

I quote
""
For OnePlus 8t kb2007 T-Mobile users who can't get their dual sims to work on nameless

Type this in termux

su

setprop persist.vendor.radio.multisim_switch_support true

setprop persist.radio.multisim.config dsds

Then reboot , dual sims works perfectly

tested on my device OnePlus 8t kb2007 using nameless 13""

 

[954wrecker]

You can try this
(Need Root)

I quote
""
For OnePlus 8t kb2007 T-Mobile users who can't get their dual sims to work on nameless

Type this in termux

su

setprop persist.vendor.radio.multisim_switch_support true

setprop persist.radio.multisim.config dsds

Then reboot , dual sims works perfectly

tested on my device OnePlus 8t kb2007 using nameless 13""

It shows both Sims but sim 2 doesn't work for me. I just ran the commands on my OnePlus 8 T-Mobile that's running global 00S 11.

 

[keesh_x]

It shows both Sims but sim 2 doesn't work for me. I just ran the commands on my OnePlus 8 T-Mobile that's running global 00S 11.

I think he said it's for 8t kb2007 not 8 in2017