Sim unlock with Hboot 1.29 topic

Hello guys,

I think my sensation xe is simlocked to T-Mobile. I have bought it off ebay and had returned it to the seller for repairing the camera. The seller has apparently fixed the issue but when i insert my sim card it does not connect to network and gives error 'your sim card does not allow connection to this network'. I have tried the settings inside phone information(*#*#4636#*#*) and also the sim unlock guide method 1 and 2. But it still does not connect. I think that the sim unlock method failed due to Hboot v 1.29. My device info is as follows

PYRAMID PVT SHIP S-OFF RL
Hboot-1.29.0000
RADIO-11.24A.3504.31_M
OpenADSP-v05.6.0.2226.00.0418
eMMC-boot



Is there any was to unlock this phone? Any help would be awesome...

Thanks!