I guest to measure the slicon omni mic this day, we have compare two pieces of them. The one piece is good and the other one is unuseless. You only need Ohm meter to measure this part as well. Ok look at the picture below

We always get bored when found customer with Lock Code phone, otherwise we only have data cable not the partner tools.
There is the simple way to do this???
Yes we could do this, by the Local Mode Battery condition.
How to create this battery, please, read carefully this picture and just try it work.