General [TMO] 9 PRO MODEM RETENTION/DATA FIX

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MudaTrucka

Senior Member
Oct 11, 2014
206
47
Parma, OH
OnePlus 9 Pro
What exactly did you do? If you converted your T-Mobile variant to Global or Europe than no that won't fix it. In that case, you would have to root and use the magisk data module to get service. That's the only way.
so I rooted and installed the data module from this thread. I see it's for c44 but I'm on c62. Is there another one that will work or must I downgrade?
 

TheSayaMan

Senior Member
Sep 12, 2016
595
258
OnePlus 9 Pro
so I rooted and installed the data module from this thread. I see it's for c44 but I'm on c62. Is there another one that will work or must I downgrade?
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.
 
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MudaTrucka

Senior Member
Oct 11, 2014
206
47
Parma, OH
OnePlus 9 Pro
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.
What did you use to go back to stock. I'm thinking that's what I want to do.
 

TheSayaMan

Senior Member
Sep 12, 2016
595
258
OnePlus 9 Pro

zefyx

Senior Member
Dec 19, 2007
230
52
Install of bothering with these broken data fixes, just install C.62 EU firmware on T-Mobile OOS12. Keep it simple!
 

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  • 20

    EXPLICITLY FOR TMOBILE 9 PRO

    (I'm not responsible for your failure to read or bricked issues, but will help assist.)

    NO MORE MODEM FLASHING!!!


    Now the Fun Part (SIMPLE)
    Backup your damn data!!!


    1. Run TmoEU MSM
    2. local update 11.2.10.10AA zip
    (Global very important)
    3A. OTA update OOS12, OTA to OOS13
    3B. Regardless at this point. Re-run TmoEu Msm to Lock-in Modem !!!
    Now follow again...
    Reboot... Unlock, Local update to 10.10AA, and take the updates to OOS13....

    AS LONG AS YOU ONLY USE TmoEU MSM as your unbrick tool



    OOS/COS DATA FIX FOR A12 (ROOT) {DEPRECIATED}
    MAGISK Module zip provided below...
    ((((Going to OOS12 & OOS13, Global build will need to be updated prior to taking A12 update. Only way data retain module will work.....))))


    (link)
    ---------------------------------------------------------------------

    ---ONLY USE TO GO BACK FOR WARRANTY & TRADE PURPOSES 👇 👇
    Use Tmobile MSM (Stock) to go back to complete stock. For warrenty, trade in purposes. No!, modem will not stick after ota, duh

    [WARNING!!!]

    --Do not use IN or EU MSM or you will not be able to go back to Tmobile stock(which voids everything with warrty, etc)

    INCASE YOU MESSED UP OR HAD NO CHOICE BUT TO SAVE DEVICE BY USING IN OR EU MSM'S. THERE IS A FIX!!.

    -Modded MSM to take you back to TMobile Stock.....


    TMO_MSM(IN-EU_Return-to-Stock)
    ----------------------------------------------------------------

    Now everything you need is available here on XDA, but for convenience it's right here.


    DOWNLOADS

    All Files Located Here!!!
    ---------------------------------------------------------------------


    FASTBOOT IMGS

    (A11 only)
    (DO NOT FLASH MODEM IMG VIA OOS A12 & A13)
    (CRASH DUMP & DEATH WILL OCCUR)


    - This will be left here for users with Non-Tmo variant, but have T-mobile service and need access to bands.
    - Just use modem flasher, unzip and run .bat file (A11 only)


    visit TG for T-mobile 9 pro for community growth and helpful conversations 👇👇

    Join «T-Mobile Oneplus 9 Pro Support» on TELEGRAM

    Donations welcomed:
    CASHAPP

    PAYPAL

    First off I can't stress enough how much time and effort was put into this process, no amount of modem flashing, no signal, and device sacrifice would stop us. Not to mention this variant is treated with extreme prejudice from OnePlus 🤦‍♂️......

    Special Thanks to:
    @Jhoopes517
    for stumbling upon signal still being there. The amount of replicating is to die for 😂 🤦‍♂️ 😂


    @FizzyAps
    for not sleeping, not even taking a damn break until it was explained & able to process😊 👍
    Without him T-mobile variant would be left in the dark.. So please appreciate his hard work and much more simplicity to come and for providing fastboot script 😊 👍

    @twinnfamous
    For providing data retain module.
    3
    Flasher.zip updated to latest 8.8 modem 👍... Sorry about the delay guys, just been dealing with a lot......
    3
    Holy crap guys,
    don't mess with or share modemst1/2
    don't mess with or share modemst1/2
    don't mess with or share modemst1/2
    don't mess with or share modemst1/2
    don't mess with or share modemst1/2
    don't mess with or share modemst1/2
    don't mess with or share modemst1/2
    don't mess with or share modemst1/2

    DON'T MESS WITH OR SHARE MODEMST1/2


    It contains your device specific info, device specific NV data, IMEI, etc. Flashing someone else's modemst will screw up your device and lose all cellular capability (and you are completely SOL if you don't have a backup), and someone with your modemst might be able to clone your IMEI.

    This is why my guides all tell you to back them up, so you can restore it in case something goes wrong. You should not be messing with it unless you know what you're doing.

    The only modem file you need to flash on to a OP9P conversion is modem.bin, AKA NON-HLOS.
    2
    i mad a simple script just enable usb debugging and run bat itll do everything for you
    2
    11.2.6.6 Modem uploaded 😊 👍