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General [MODEM] [9Pro] Tmobile Quickfix

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1NewbieRooter

Member
Jul 22, 2021
8
3
OnePlus 6T
OnePlus 9 Pro
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)
 
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freddienuxx

Senior Member
Dec 11, 2012
1,623
304
Neptune City NJ
OnePlus 8 Pro
OnePlus 8T
I flashed the modem and wow I have never seen this before
 

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  • 10
    EXPLICITLY FOR ONEPLUS 9 PRO

    This thread is created to provide all who need T-Mobile Modem.img, from loss of service due to an OTA, Flashing, or EU Conversion gone wrong....

    Also to prevent cluttering up other threads with same question. 👍

    IMPORTANT!!!
    - Backup your Modem images from Tmobile
    using a Partition Backup app.
    - Backup both Modem_A & Modem_b(very important)

    Partions backup app link provided 👇 👇


    ***THIS IS NOT A PERMANENT FIX

    THIS IMAGE BELOW [modem_a] IS ONLY INTENDED FOR THOSE WHO NEED IMMEDIATE SERVICE, OTHERWISE MSM TOOL BACK TO
    T-MOBILE. UDATE OTA TO LATEST (11.2.6.6) BACKUP YOUR OWN MODEM A/B (BOTH ARE VERY IMPORTANT) PROPERLY FOR COMPLETE TMOBILE SERVICE, THEN RESTORE AFTER SUCCESSFUL EU CONVERSION (OTA LATEST UPDATE), CUSTOM ROM, or OOS OTA & LOCAL UPDATE.

    Tmobile MSM tool provided 👇 👇


    --- Fastboot Flash Quick Fix Img
    Unzip image, move to PC 🔄
    Reboot to Bootloader
    fastboot command
    "fastboot flash modem *modem.img"
    *Replace modem with tmobile modem.
    Reboot system

    THIS IS YOUR ACTUAL FIX

    --- Fastboot Flash YOUR Modem Imgs
    After successful update or conversion
    Open backup file in PC 🔄
    Reboot to bootloader
    fastboot command
    "fastboot flash modem_a modem_a.img
    "fastboot flash modem_b modem_b.img
    *Replace modem_a with tmo modem_a. img
    Replace modem_b with tmo modem_b. img
    Reboot system


    For extended and accurate conversions

    Donations welcomed:
    Cash App: $Libra420T

    **Edit:
    If from Tmobile, flashing to custom rom, service should be fine...
    -If using EU conversion to avoid unlock.bin, then you absolutely need to flash modem after every update...
    -Have non NA variant and have Tmobile service

    ***Reason to backup modem
    OTA update causes Tmo modem to be replaced..
    -EU does the same...
    -Or just want Tmo modem instead of stock(oxygen) because you have tmobile service on unlock 9 pro

    Good luck & Happy Flashing 😊👍
    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.
    3
    Okay, gimme a few. Gotta start up my ancient laptop and throw it on the otg drive, upload it to gdrive, and I'll post the link here. 😎

    Edit: Link Posted. https://drive.google.com/drive/folders/1LFEy0q58Dke1t_Uh7bdTxdp-wY0YFs_Z?usp=sharing

    Modem_a/_b are fastboot flashable. Modemst1/st2 have to be flashed via fastbootd.

    Fastboot flash modem_a modem_a.img

    Fastboot flash mkdem_b modem_b.img

    Fastboot reboot fastboot

    Fastboot flash modemst1 modemst1.img

    Fastboot flash modemst2 modemst2.img

    Fastboot reboot

    These can also be replaced in payload.bin firmware fastboot roms. Just extract via payload dumper, place these modem files into the rom, then fastboot flashall in fastbootd.
    2
    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.
    2
    I pulled the modem files to the 11.2.5.5 T-Mobile firmware for the OnePlus 9 Pro if you want them. If it helps anyone. I do seem to get much better service on the 5.5 modem than I did with the 2.2 modem.

    In my room, I always got 1 to 2 bars. I now get 3 to 4. Granted, I use Wi-Fi most of the time, but my 5G is faster than the Wi-Fi here due to not being able to get good internet out here.