Normally you can change your pincode easily via Setting>System>Security>PIN Code (see movie).
If you have updated to Firmware version 1008 or higher you might encounter the situation below:
E.g. You want to change your current PIN 0000 to 1234 (not really safe suggestions).
You cant press the Confirm button since it is grayed out
Because a 4 digit password is relatively easy to guess, a minimum of 6 digits is required since the 1008 firmware version (The password in the example below is not really a safe one to choose).
Now you can tap the Confirm button since it is not longer grayed out.
You will get prompted that your PIN was changed successfully.
For detailed information about the latest firmware version click here
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