I have made my own Flasher cable for 8210 but When I placed it in the phone and start Rolis Flasher software a continous noisy sound come from the phone. And when I click on the read button it popup an error message box with the following message:

Power OFF mobile first and then connect
(Or check cable: phone TX=low(0) expected but phone TX=high read)

I have double checked my cable but it seemed that there is nothing wrong with it.

Is my phone damaged?