How To Guide LE2127 OnePlus 9 Pro Custom ROM (T-Mobile)
- Thread starter zefyx
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And that's way my TMobile convert to eu. No need to eu to MSM conversation And I can update via system updater. No need to flash modem after ota. I can enjoy stock eu ROM without any problem. Am I right?
Bulauski2005
Senior Member
- Feb 12, 2017
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I am on TMO, and that is where I prefer to stay. Less hassle with stock firmware. My phone is working great, no issues!
Ya it seems good Im new to the phone in Canada everything is unlocked just hate the Tmob pink splash screen! LOL
Bulauski2005
Senior Member
- Feb 12, 2017
- 163
- 38
No you need to convert to EU OOS 11 with MSM Download Tool first. Then install the OOS software from the OnePlus website then update to OOS 13 F.18 and factory reset. Do not update past F.18 or you will have network issues but OnePlus 9 pro runs excellent on F.18 Global 13 Rom. Cheers !
How should I flash the firmware?, via fastboot? Also wanted to ask, the OOS software from the website is installed via the android local upgrade right?
Just got my new phone and I would not like to screw it up
Bulauski2005
Senior Member
- Feb 12, 2017
- 163
- 38
You won't if you follow my instructions correctly ! 1. Flash phone with EU MSM Tool. 2. Install OnePlus 9Pro software from OnePlus website in local upgrade on phone. 3. Update to F.18 or install F.16 to get there faster. 4. Factory reset and set up new phone. Viola you have a fully function global OnePlus 9 Pro with no pink boot screen.
If you are rooted, the bootanimation can be changed...
Especially on LE2127 firmware...
Bulauski2005
Senior Member
- Feb 12, 2017
- 163
- 38
Bulauski2005
Senior Member
- Feb 12, 2017
- 163
- 38
It will convert you to Le2125 Global from EU instead of Le2123
Bulauski2005
Senior Member
- Feb 12, 2017
- 163
- 38
can't i install custom rom if i was on 2123 version
are you sure? i did as i remember
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3I am seeing a lot of folks who are still (year later) unable to enjoy custom ROM with T-Mobile devices, so I wanted to quickly post this easy method for enjoying your device with FULL DATA. If you are using a T-Mobile branded OnePlus 9 Pro and have accepted all normal OTA updates as of 9/8/22, you should be on C.19 firmware.
Assuming you have already unlocked your bootloader, you can safely upgrade to EU C.62 firmware found at:
I completed this process while already on Nameless but it should work for others too. No more dodgy modules, hacked MSMDownloadTools or sorta working phones. Note, firmware and local updates are NOT the same. You are not cross-flashing to an entirely new software but ONLY required firmware modules for latest custom ROMs. Hope this helps!
P.S. if you receive any error while sideloading your new firmware, DO NOT unplug or reboot your phone. Repeat the process until it's completed successfully.22Update:
I'm going to keep this brief since I've spent a lot of time on it today and need to go touch some grass and look at trees, or something.
I couldn't do much in the way of backing up, so I went ahead with LineageOS. Having sim and bootloader already unlocked, there were no issues. My phone was on C.17 and I couldn't get to C.19 after some trying, so I gave that up. Probably a moot point since I ended up flashing a new ROM anyway. There were a couple of hiccups in the road, some of my own making. I installed the official LineageOS ROM and immediately remembered that I had meant to install microg for LineageOS since that's my setup of choice atm. It took my a while to get that straightened out, what with downgrading problems and all. Then I lost touchscreen. Went back and reflashed everything, but this time with microg recovery as well, and I was back in business. Now this gets us to the point that is germane to this thread:
I rebooted, sideloaded the C63 firmware on top of the setup I just mentioned. Rebooted again, dropped in a TMO SIM and everything seems great. 5G and calling are working fine. No obvious problems. It boots and runs, it is not bricked. Having said that, I haven't spent much time using it, so that's all I have to report for now.1My system update is showing c.17 as the latest update. I can't seem to get c.19. Would switching to eu firmware delete user data too?
