yashsingh1/xdaforums huggingface dataset:
[OnePlus 9 Pro] TheSayaMan:
It works for c62 also because I was on c62 and it was working. I decided to go back to T-Mobile stock and not deal with it. If you decide to sell the phone eventually, most buyers are not going to want to go through all this. To get it working properly, you need to start with EU A11 and take all full local upgrades to Global A12. Then apply the module and you won't have any problems. If you take the updates through the built in system updater than you will have problems.
[OnePlus 9 Pro] MudaTrucka:
What did you use to go back to stock. I'm thinking that's what I want to do.
[OnePlus 9 Pro] TheSayaMan:
I'm not sure if your target is EU or IN. Try this one. It has EU as target to get you back. If not, I'll send you the IN one next.

File on MEGA

mega.nz
[OnePlus 9 Pro] MudaTrucka:
Thank you, I appreciate all the help. Will update when I download and try to downgrade.
[OnePlus 9 Pro] TheSayaMan:
Also, if you are unaware, this will lock the bootloader and you will be required to have a unlock code from T-Mobile to unlock it again.
[OnePlus 9 Pro] MudaTrucka:
I am getting sahara communication error. But yes I still have my unlock code
[OnePlus 9 Pro] TheSayaMan:
Only checkmark auto reboot and lite firehose
[OnePlus 9 Pro] MudaTrucka:
That worked! Thanks again!
[OnePlus 9 Pro] TheSayaMan:
Awesome, your welcome
[OnePlus 9 Pro] samdaman91:
Do you have the IN to Tmobile one? or will the EU to tmobile work on the IN rom?
[OnePlus 9 Pro] TheSayaMan:
The one I posted won't work because it's for EU target only. Try this one with IN target.

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[OnePlus 9 Pro] zefyx:
Install of bothering with these broken data fixes, just install C.62 EU firmware on T-Mobile OOS12. Keep it simple!
[OnePlus 9 Pro] TheSayaMan:
Really? No!!! You can't do a local upgrade from T-Mobile to IN, EU or Global. You can cross between India, Europe and Global from India, Europe and Global but that's it.
[OnePlus 9 Pro] zefyx:
Huh. I don't think you know what you're talking about.
[OnePlus 9 Pro] TheSayaMan:
I do. If it was that simple there would be no need for a T-Mobile to EU MSM or Global, etc
[OnePlus 9 Pro] roirraW "edor" ehT:
<Moderator Note>: Thread cleaned.

Always heed Rule 2.3 from 📚 XDA Developers Forum Rules 📚:

If you feel that you can't reply to another user's post without breaking XDA's rules, then don't reply at all.

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Thank you!

@roirraW "edor" ehT
[OnePlus 9 Pro] CZ Eddie:
I think I'm missing something.

Where are the global updates we are supposed to be local-flashing?

I didn't see any download links for these.
[OnePlus 9 Pro] CZ Eddie:
Isn't re-running MSM just undoing everything we did in steps 1-3?
[OnePlus 9 Pro] TheSayaMan:
You can use the oxygen updater to get the Global updates. You don't have to go through all this. My target is Europe. I just use the Europe MSM then take all local updates through the oxygen updater app. Just change your device in the Oxygen updater app to whatever you want. Europe, India or Global. In any case, your going to have to use the Magisk data retain module because once you update to 12, your not going to have service otherwise.
[OnePlus 9 Pro] CZ Eddie:
Thanks, I wish the OP would mention this and also list the appropriate filenames.

Also, to the OP.... the MSM tool [T-MobileStock-MSMTOOL11.2.6.6] you've got listed does not work for my phone at least.

I get "unsupported device" error.

Same with the MSM TheSayaMan listed earlier [TMO_MSM(IN-EU_Return-to-Stock)].

The one I downloaded last year seems to be working fine.

I can't seem to find where I originally downloaded it from.

Here's a screenshot of it.

And by working "fine" I just mean it put me back onto a TMO ROM.

But while my SIM is found, I'm not getting any data for some reason.

No cellular reception at all.

This whole thread has been an absolute disaster for me so far.
[OnePlus 9 Pro] TheSayaMan:
That appears to be the T-Mobile MSM. Did you convert your phone to another variant? If you used the India, Europe or Global MSM then your target is permanent changed and can't be changed back. You would have to use a IN or EU back to TMobile stock MSM to return to TMobile stock. Also when you are using the MSM tool, make sure that only auto reboot and lite Firehose are check marked.
[OnePlus 9 Pro] CZ Eddie:
Since when?

I've never had problems until I came to this thread and used the files listed within it.

I've MSM my TMO phone to EU a dozen times over the last year and never had problems MSM back to TMO before.
[OnePlus 9 Pro] TheSayaMan:
Yes I'm just saying you would have to use the EU back to T-Mobile stock MSM to get back. The regular T-Mobile MSM will not work ever again once you converted it to EU.
[OnePlus 9 Pro] CZ Eddie:
I'm not following you? Both of the MSM listed below gave me the MSM error in the screenshot below when I tried to go back from the EU ROM listed in the OP, back to TMO ROM. One of them is the MSM you recommended to another XDA'er.

TMO_MSM(IN-EU_Return-to-Stock)

IN-EU_Return-to-Stock

As mentioned, I had to use an old TMO MSM tool to get me back to TMO.
[OnePlus 9 Pro] TheSayaMan:
It's all based on whatever your target is. The IN-EU_Return-to-Stock is misleading. That's for India Target only actually. Only the EU Target back to TMobile will work. I've been down this road before and got help from another member to get me back to TMobile stock. I would recommend just going back to TMobile stock and you can always flash roms after that if you want to. That whole data retain thing is annoying to me and in my case I don't wish to keep root which is what you are required to do if you stay on Global.
[OnePlus 9 Pro] CZ Eddie:
Well, moving on from the MSM conversation.... I've already MSM'd back to T-Mobile. Twice.

And I have no data service.

My SIM is detected as T-Mobile but I get "No Service" in my status.

So, I tried MSM to EU and left it at Android 11 and installed Magisk.

Then, I ran the TmoModemFlasher_8.8 with no change in problem.

Then, I ran the Data_Retain.zip and still no change in problem.
[OnePlus 9 Pro] TheSayaMan:
The modem flasher isn't going to fix the no sim issue. That happens because the Global, EU and India a12 firmware will show 2 sims which we only have one and the data retain module will allow it to show 1 sim and get it to work. You also have to do local updates to a12. Doing auto updates through system updates is going to cause problems also. Just stick with T-Mobile stock and you will be fine.
[OnePlus 9 Pro] CZ Eddie:
I don't think you're reading what I'm typing.

I don't have a No SIM issue. I have never had that issue.

I have a "No Service" issue.

My problem was also on T-Mobile stock.
[OnePlus 9 Pro] TheSayaMan:
Sorry, I misunderstood. Maybe you could try taking the sim out and reinsert it. It's also possible that there is a issue with your sim and it needs to be replaced.
[OnePlus 9 Pro] TheGhost1951:
Flash the TMO non-halos.bin to modem in fastboot
[OnePlus 9 Pro] CZ Eddie:
Thank you. There is no change in problem though.
[OnePlus 9 Pro] TheGhost1951:
Then you have some garbage lingering somewhere that is corrupting going on in your phone! I have bricked my device, installed Indian firmware, global firmware, but have always been able to flash a modded MSM Download Tool for TMO and be back to stock with everything....
[OnePlus 9 Pro] NameIsOptional:
I had the same issue. To fix it I updated to android 12 11_C.20 then used the msm to go back to T-Mobile stock. I then updated once again to 11_C.20 and used the msm. It makes the modem stick for android 11.
[OnePlus 9 Pro] CZ Eddie:
Damn, I backed up a ton of stuff awhile back using Payload Dumper but modemst1/2 got missed somehow.

Did you flash the datafix while you were in 12 before you MSM'd back to TMO?
[OnePlus 9 Pro] NameIsOptional:
No. It seems to be an android 11 glitch. If you update to T-Mobile android 12 then msm. It should fix your issue. I don't know if it's a temporary fix or permanent but it worked for me.
[OnePlus 9 Pro] CZ Eddie:
Could you clarify your steps for me?

Sounds like you're saying to:

MSM to stock TMO

Take OTA updates all the way until you get the TMO Android 12 version 11_C.20

MSM to stock TMO (again)

Take OTA updates all the way until you get the TMO Android 12 version 11_C.20

MSM to stock TMO (again)

So far, I've MSM to stock TMO.

Then, I OTA updated all the way up to Android version 12 "11_C.16".

I'm doing the next 12 update now (c.20).
[OnePlus 9 Pro] CZ Eddie:
Interestingly, after I hit the first Android 12 update, my SIM now comes up as "CARD" instead of "T-Mobile".

And shows as SIM 2 in the "about" section.
[OnePlus 9 Pro] CZ Eddie:
Tried this but still not getting any network service. ugh

And phone SIM still showing up as "CARD" now too, instead of "T-Mobile".

And I see an "MEID" instead of an IMEI when I go to about/phone.

IMEI isn't lost but doesn't seem to be used as option #1 or something.
[OnePlus 9 Pro] CZ Eddie:
@Libra420T you mentioned in another thread that you had the same "No Service" issue before but I missed where you said what the fix was?
[OnePlus 9 Pro] Libra420T:
Guide & Files updated.........

I would like everyone to know that I have completed my work here for OnePlus 9 pro. This will be the last update as I no longer have time for this device. Thankfully modem retention is/was a success. I would like to thank each and everyone of you. If you like my work, pick up a Pixel 7 series 👍

Also new link...

Support for T-Mobile OnePlus 9 Series

Telegram: Contact @TMO9support

t.me
[OnePlus 9 Pro] AharonG20:
do I have to re-flash MSM if the modem works after 3A?
[OnePlus 9 Pro] TheSayaMan:
Not necessary anymore since a13. Don't need this. It's a old thread and should be closed
[OnePlus 9 Pro] AharonG20:
thanks, so just to be sure - I bought a "global version" on aliexpress which turned out to be TMO. I don't live in the us and it let me unlock the sim, I then followed the steps above. I now have global A13 rom and a working modem, do I have missing bands or am I clear? is there a way to check?
[OnePlus 9 Pro] TheSayaMan:
If you converted it to Global, you won't be missing anything. I did the same thing with my T-Mobile model.
[OnePlus 9 Pro] joecool1029:
Not exactly true. If you intend to use the phone on T-Mobile, the Global firmware is missing their NR-CA combos for SA mode. This means it cannot aggregate a lowband 5G with midband 5G, phone has to hop between congested lowband or weak signal midband. If you do intend to use Global firmware on T-Mobile network, it would be a good idea to make sure the phone stays in NSA 5G mode for better performance.

I am considering making flashable firmware zips with the T-Mobile radio for those on custom firmware but want to wait for both the custom rom devs and t-mobile to be on 13 (and 13 blobs, most of the 13 roms are still shipping on 12 blobs).
[OnePlus 9 Pro] joecool1029:
I had similar issues and it was due to screwing up my persist and/or efs partitions by flashing wrong modem. Bad news is MSMtool won't fix your issues. I was lucky and had the modemst1/modemst2 backed up which did fix mine. In my case phone worked if I set it to 4G, but 5G was almost totally broken until I flashed my backup on.
[OnePlus 9 Pro] TheSayaMan:
In my case, I'm not on T-Mobile. My T-Mobile variant is carrier unlocked to Verizon.
[OnePlus 9 Pro] joecool1029:
Makes sense, I think it's the last Oneplus you can buy with mmwave bands. I think you should be ok, they don't lean heavy on SA yet from what I recall.
[OnePlus 9 Pro] chronicmaniac:
Hi Guys;

I have LE2127. It was turned to LE2123 (with EU rom). My current version is LE2123_11_F.74. Everything working fine.

But;

My network connection lost or coming too late (around 1 minute) When I restart my phone or open and close airplane mode.

If my network not come, I'm pulling out my sim tray and put it in again and network come.

There is 2 sim card looking at settings.

I have some questions about these.

1- If I convert my rom EU to Global, will my network problem be fixed and will my phone be single SIM?

2- If I convert my rom EU to Global, will my IMEI change or lost?

3- If I change my rom EU to Global, should I downgrade my rom step by step 13 > 12 > 11 or can I flash Global rom directly via local update or something?
[OnePlus 9 Pro] TheSayaMan:
Your going to have the same problem on Global although I think Global is less buggy and yes, you can downgrade and you can also use the EU to Global MSM I posted earlier in this thread. Either way, your phone will be wiped so back everything up.
[OnePlus 9 Pro] chronicmaniac:
Thank you bro. But I cant find EU to Global MSM in the earlier posts.

Can I change it in OOS 13 with A13 ? Or should I downgrade to A11 ?

Is my modem will change it too?

Sorry dude I asked too much question to you.
[OnePlus 9 Pro] TheSayaMan:
Go back a few pages, its there, your going to be back on a11 if you use EU to Global MSM
[OnePlus 9 Pro] KCAndroid13:
I have the same device and went through the same conversion and just updated to F.74 as well. When you say everything is working fine, you mean everything BUT the networking? My networking is messed up. If I'm lucky, I briefly get a 5G signal that goes to 4G and then sits on EDGE. I also have the dual sim setup in settings. I lost VoWIFI and also noticed airplane mode doesn't disable wifi in this version. I wish there was a straightforward way to rollback to F.73 or some way to not have to spend hours re-installing and re-configuring all my apps with having to do another conversion.
[OnePlus 9 Pro] TheGhost1951:
Who is your carrier?
[OnePlus 9 Pro] KCAndroid13:
I'm on Mint which is a TMO MVNO
[OnePlus 9 Pro] TheGhost1951:
You may have to flash the TMO modems to the phone to get it corrected..... What Android version are you on?
[OnePlus 9 Pro] KCAndroid13:
I'm on A13. The last version (F.73) was 13 as well. I was just extracting the modem.img from F.73, you think that's a waste of time?
[OnePlus 9 Pro] TheGhost1951:
Nothing ventured nothing gained, a modem is a modem, it is hardware and the modem images between 12 and 13 should be basically the same.
[OnePlus 9 Pro] KCAndroid13:
Ventured but no gain. Tried the previous (F.73) modem and the previous for the Global ROM (F.16), neither helped at all. I feel like it's more than just the modem.img, I lost the VoWIFI functionality, it's showing 2 SIMs (both with the same IMEI...), the whole "wifi doesn't turn off when first switched into airplane mode"
[OnePlus 9 Pro] TheGhost1951:
It has to be modem images for t-mobile, not just any images...
[OnePlus 9 Pro] KCAndroid13:
That's not my understanding from the conversion thread nor from my experience of going through several OTA updates since doing the conversion itself. Plus, there's other functionality that seems borked with this particular update (though maybe they're artifacts of the modem being whacked)
[OnePlus 9 Pro] chronicmaniac:
Sorry we dont have 5G network in our country I cant test it. But VoWifi working. I think my network speed is slow like yours.
[OnePlus 9 Pro] Mogster2K:
Having similar problems here. T-Mobile LE2127 converted to EU LE2123 and recently updated to F.74. I have no LTE or 5G on T-Mobile; only 2G seems to work. Sim and bootloader unlocked and rooted with Magisk 25.2.
[OnePlus 9 Pro] KCAndroid13:
Wish I had better news for you but I wasn't able to resolve it with any of the attempts I made at keeping the same version installed (e.g., tried flashing modem images, tried some settings to hide the dual sim). What did work was redoing the MSM setup. Modem worked fine through updates to F.16 I think it was at which point I switched to nameless and am now trying crDroid (latest build from Feb 17, Android 13) -- modem working fine with nice 5G signal
[OnePlus 9 Pro] runningslow:
I'm in the same boat. LE2127 converted to LE2123 and my data worked fine until I updated the phone yesterday. Now nothing. Occasionally I'll see an E, but typically not even that.

When I have the time, I'll MSM back to T-Mo and probably just leave it there. In the meantime, I can live with WiFi.
[OnePlus 9 Pro] Jed!Master:
im stuck on edge only on f74 anyway to go back to f73? thanks
[OnePlus 9 Pro] Mogster2K:
Well, I found F.73 in another thread and attempted to flash it with Fastboot Enhance. It appeared to work but the phone got stuck in a bootloop, even after wiping /data. I redid the conversion process with MSM and now I'm taking updates from Android 11. Currently debating whether I want to go back to F.73 or switch to Lineage or something.
[OnePlus 9 Pro] Appreciative:
Can you try toggling volte off/on and leave it on? I had an issue when I flashed where I lost 5G and LTE. It would briefly connect to them and kick me off onto Edge. It didn't do this the first time I flashed Eu but after I went back to Tmo and flashed again, it did. I was able to fix it by toggling volte on, off, and then back on and leaving it on
[OnePlus 9 Pro] runningslow:
I can't find the toggle for VoLTE in my settings, even searching for it...

Looks like there are a few guides for enabling VoLTE on "unsupported" OnePlus 9 Pros in the forum that I might have to try before I resort to the MSM

Edit: Looks like those guides are for OOS11, not OOS12 or OOS13
[OnePlus 9 Pro] Phillis:
I would like some clarifications. If I wish to stay on A11. I only need to run the first 2 steps?

1. Run TmoEU MSM

2. local update 11.2.10.10AA zip

(Global very important)

Or do I still have to run 3A and 3B and then go back to 11 after (part where it says :

Now follow again...

Reboot... Unlock, Local update to 10.10AA, and take the updates to OOS13....) ?

Thanks
[OnePlus 9 Pro] TheSayaMan:
This thread is outdated. If you want to stay on a11 then just MSM back to a11 and take last a11 update, don't need to do anything more than that
[OnePlus 9 Pro] Makkufurai:
Has anyone tried to update this for the newer firmwares?
[OnePlus 9 Pro] helstonrampersad:
yea I have many times, tmobile oneplus 9 pro converted to eu software oos 13 data isnt working at all, it work on oos 11, when flashing this data retain zip it fails in magisk, what am I doing wrong ? If I upgrade from eu oos 11 to eu oos 13 the data on tmobile will not work
[OnePlus 9 Pro] mbj731:
Hate to bring up an old thread but I STILL have the no sim/dual sim problem on A13 and even A14 I think! (I reverted back to 13)!

My understanding is this problem was fixed with A13, so why am I still having to use the magisk module to get mobile data to work without it? TMobile OP9pro converted to Global.

Do I need to take all of the steps of reverting back to Stock TMO and updating all the way back to global a13 or something?
[OnePlus 9 Pro] TheSayaMan:
Are you sure your on Global? The issue you described happens with T-Mobile converted to Europe. If your on Europe, just take next local update to Global. If your sure your on Global, factory resetting one time will solve the problem.
[OnePlus 9 Pro] mbj731:
I'm on LE2125 13.1.0.592 (EX01). Upgraded to global version A14 but battery drain was crazy so I used a fastboot flash back to my current ROM.

I'll try a factory reset later. But pretty sure the fastboot ROM did a factory reset before install.
[OnePlus 9 Pro] craznazn:
No, I never owned a OP9 but the conversion thread's OP has a Tmo modem in his conversion package. Give that a shot.

As for the SIM strangeness... if you did flash someone else's modemst, they are not touched by MSM. You need to flash your backup back onto the device. If you didn't make a backup, you are pretty f'd, just hope it works... =/
[OnePlus 9 Pro] TheKnux:
DO NOT FLASH modemst1 or modemst2.

Thanks @craznazn. Will delete files from folder so the modem_a and modem_b are the only two files in there. Also, these are the modems from the Pro variant. OOS 11.2.5.5. T-Mobile firmware.

Edit: files removed.
[OnePlus 9 Pro] hllywd:
I don't use twrp so how do I backup my modem? Through bootloader cmd? Sorry for newbie question.
[OnePlus 9 Pro] xpdragon:
Worked for me on OP9 Pro.

dd if=/dev/block/bootdevice/by-name/modem_a of=/sdcard/modem_a.img

dd if=/dev/block/bootdevice/by-name/modem_b of=/sdcard/modem_b.img
[OnePlus 9 Pro] hllywd:
Again forgive my newbieness but what is dd?
[OnePlus 9 Pro] hllywd:
Well that worked pretty sweet. Thanks
[OnePlus 9 Pro] hllywd:
Can any of the modem images be flashed through something like Franko kernel manager?
[OnePlus 9 Pro] Libra420T:
def

definitely not, just flash in bootloader
[OnePlus 9 Pro] hllywd:
I'm trying but it won't work. Must be typing something wrong.
[OnePlus 9 Pro] 1NewbieRooter:
i flashed the modem.img in fastboot after installing lineage os 18.1 & gapps. There was no signal in the beginning as the modem was deleted I guess. This modem.img was perfect (lifesaver) for me. After rom set up, it is picking up signal and recognizing sim no issues.

regular fastboot:

fastboot flash modem modem.img

***I have a OnePlus 9 Pro (tmobile)
[OnePlus 9 Pro] 1NewbieRooter:
common mistake I made at first was that, the modem file wasn't in the folder I opened CMD from. Double check & try again probably just that.
[OnePlus 9 Pro] Libra420T:
Major update to thread guys.

checkout the updated guide in post #1

😊 👍
[OnePlus 9 Pro] hllywd:
I have it in the right folder but I don't think I'm typing it right for the a & b partition. What's the right way?
[OnePlus 9 Pro] anhtin:
So i have the 9 pro ordered on oneplus NA website, and im currently on Tmobile. Here and there i got problem with sending/receiving MMS. Should I flash this modem?
[OnePlus 9 Pro] Libra420T:
troubleshoot always before flashing.

but to be clear mms, issue from Google messages (chat features) or in general?
[OnePlus 9 Pro] 1NewbieRooter:
I didn’t have to flash a & b. With the modem.img in the folder, i opened cmd and “fastboot flash modem modem.img”.
[OnePlus 9 Pro] hllywd:
I finally got it. Problem with my laptop. Plugged into pc & worked right away. I'll have to check drivers on laptop. Thanks
[OnePlus 9 Pro] anhtin:
Yea MMS in general, mostly from friends with iPhones.
[OnePlus 9 Pro] freddienuxx:
I flashed the modem and wow I have never seen this before
[OnePlus 9 Pro] Libra420T:
How to turn off RCS chats

messages.google.com

go here and put in number and info, might fix before flashing.
[OnePlus 9 Pro] Libra420T:
Updated with Latest Guys 😊 👍
[OnePlus 9 Pro] Libra420T:
Join group chat on Telegram

t.me

for easier access and easier conversions 😊 👍
[OnePlus 9 Pro] Libra420T:
11.2.6.6 Modem uploaded 😊 👍
[OnePlus 9 Pro] bdaviesweb:
Dumb question, anyway to flash in fastboot without a pc? :)
[OnePlus 9 Pro] Samuel Holland:
Yes, with the magisk adb & fastboot module on another android, it will act as the computer.
[OnePlus 9 Pro] anhtin:
So with the unlocked OnePlus, I can't use chat features if I want a better T-Mobile service signal?
[OnePlus 9 Pro] Libra420T:
not sure i follow, chat features not working? take screenshot of chat settings. Otherwise fill out the info at link, and u should receive a G-code to validate chat features.... 🤔
[OnePlus 9 Pro] anhtin:
Like I said before in this thread, sometimes I don't get MMS texts from people, especially iPhones. My chat features work fine with other Android with Google messages app.
[OnePlus 9 Pro] Libra420T:
Did you try and reset apn's?
[OnePlus 9 Pro] anhtin:
I did but didn't help. I also contacted T-Mobile but they weren't helpful
[OnePlus 9 Pro] anhtin:
Thank you. I think it's it. I used iphones for a short while andy number is still linked to iMessage. It's been better since I signed out of it. Thank you so much
[OnePlus 9 Pro] Libra420T:
awesome that's super good to know 😊 👍
[OnePlus 9 Pro] FizzyAps:
i mad a simple script just enable usb debugging and run bat itll do everything for you
[OnePlus 9 Pro] Libra420T:
Thread updated Guys 😊

Get flashing, modem_b now included

Special Thanks to @FizzyAps for script 👍
[OnePlus 9 Pro] FizzyAps:
hope you all enjoy
[OnePlus 9 Pro] Libra420T:
Anyone willing to flash back to tmobile 11.2.3.3 (via Tmo MSM), and backup every single img; compress & share here or TG for me? 🤔