help imei change now says unlock blocked

[daz]

hi all i hope you can help me i changed the imei on my gd87 now it wont accept a sim card it says unlock blocked contact suplier can anyone help

[Tecnik]

hi all i hope you can help me i changed the imei on my gd87 now it wont accept a sim card it says unlock blocked contact suplier can anyone help

Think you might need to change it back to the original IMEI?
How did you do it anyways?