Xperia T unlock problems

[jmposvip]

Long story short, I have a sim locked xperia T ( LT30p).  I went to a service and none of them could unlock it. They dont' know what's wrong with the phone. 

In service menu>model info it says LT30p but when they input the imei number in the unlocking software it says  Xperia TL LT30at. But it is not a at&t phone, it does not have their branding on the phone. 

So what happend to this phone? Can I unlock it? Can I reverse it what ever happend to the phone?

Please help

[Uliwooly]

This phone was flashed with AT&T's firware or if you see the AT&T icon on the front of the phone that could be the cause 

[jmposvip]

Ok, can i reverse it or flash it with another firmware other then at&t bc they cant unlock at&t. The phone does not have the at&t logo on it, it's not their phone

[Uliwooly]

You can flash it 

http://talk.sonymobile.com/t5/Xperia-Z-ZL-ZR/How-to-manually-update-downgrade-root-2013-Xperias/td-p...

open the SIM cover and pull out (carefully) and check the info on that paper/plastic 

[jmposvip]

Ok, that's great, can u send me a link specific for xperia T or a guide for xperia T bc I'm new to android. I know it's alot to ask but I would be so grateful 

[jmposvip]

btw. what should I pull out? when I open the sim/micro sd cover there is nothing to pull out

[Uliwooly]

I don't my Xperia T next to me but if you open one of the covers you should be able to see a white paper/plastic with info on the device, it will tell you if its a LT30a or LT30p or LT30at 

[jmposvip]

In the service menu it says that it is LT30p. 

If u could  write me a guide or something so I could do it

or a link for just flashing

thank you

[Uliwooly]

http://talk.sonymobile.com/t5/Xperia-Z-ZL-ZR/How-to-manually-update-downgrade-root-2013-Xperias/td-p...

[jmposvip]

Hi, i found a stock rom( xperia T LT30p generic firmware, unbranded, central europe). If i flash this firmware will it change my imei number, will I be able to unlock it?