Unlocked at&t m8 only gets edge on T-Mobile please help

What's up guys so let me start out by stating I am no noob when it comes to ROM related funness however I am new to HTC stuff. I bought a at&t HTC one m8 and unlocked the phone then unlocked the bootloader and S off then realized I could only get edge data so I did some reaserch and really can't find anything in how to fix this minus I read how to change the cid to cid 11111111 but still I have no LTE 4g hspa or even 3g any help will be greatly appreciate thanks in advanced.

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