Need help on changing IMEI with Wintesla
 

I tried o calculate the "password" with Nkcalc.exe (IMEI pass calculator for Wintesla 5.38), it gives something like this:

IMEI nunber/hex number/hex number

and then it says to put this pass code in Wintesla "IMEI programing Id" menu, but i only see a menu that says "IMEI programing data" or something like that.
I them put the pass code inside and then selected "Write", but Wintesla says that the data entered is invalid.

Does someone know in wich field of Wintesla (for changing IMEI) do i put the code generated by Nkcal program?

Tkans in advance.

Vic