trying to recover a used u11

[zax10]

Alright guys. Have not been on in years. Couldn't pass up an opportunity. $40 U11 in near mint physical condition. Now on to the fun part.

HTC U11
2PZC300 U-3U
Attaching photos of build info

The phone runs off WiFi perfectly. However it will not connect to mobile service (US ATT)

It registered my cell phone number so it is reading the card.

The seller says it was a Sprint phone but everything I can find says that Sprint builds are based on 2PZC5.

I want to just take it back to factory stock and then go back in and add twrp etc. I just don't know where to begin. Anyone have any ideas

 

[zax10]

Added photos

 

[zax10]

Well just got curious and did an IMEI check with T-Mobile. They list the IMEI number as a 2PZC5 model but the back of the phone says 2PZC300.

 

[zax10]

Really hope someone has some ideas. Because at this point I am leaning towards someone changed the imei number or something.

Also when I insert my sim into the phone it pops up asking what carrier I am using. After that the att apn settings are applied buts that's it. So I don't think it is carrier locked.

 

[zax10]

Alright so I can't get s-off to take again but I have figured out the firmware I can flash is for the unlocked us version but even flashing the latest firmware and installing omj badboy us unlocked I still don't have cell service. It ask me which carrier I am using with the sim card insert. It has yet to ask for an unlock code. I cannot use any dialer codes to check serial etc.

The only rom that let me use dialer codes was the Sprint based rom by omj but I can't flash firmware for it. I don't think this phone is done. Hoping someone reads this and responds with an idea

 

[zax10]

Well another update. Emailed HTC with all the info I had. They confirmed that the phone was originally a Sprint based phone. Now I need to figure out how to s-off so I change ruu back to Sprint. Sunshine won't pass test and s-off had just came out when I got out of rooting.

 

[kolembo]

This thread will help

https://forum.xda-developers.com/u11/help/htc-u11-downgrade-pie-to-oreo-t3962791

 

[zax10]

Well I have reached the end of my rope. Finally figured out which base it was based on HTC helping me lol. Flashed the correct firmware with no issues. Flashed the correct ruu using sd card method and failed on systemimg_23. Now can't access fastboot via pc in anything but bootloader. Download mode and ruu mode don't recognize on my PC. Have uninstalled all drivers and reinstalled fresh drivers with no luck. Thought I was on the right path but unfortunately not.