here is a new post about these models:
How to use the destination setting tool
Note 1: Please use this tool after closing other application software.
Model : NWZ-E463/E464/E465
Destination setting (DEST)
The destination setting, language information, and sound pressure
regulation information are written in the NAND fl ash memory.
Note: Not used for the servicing.
Nevertheless, you can try the testmode with the service manual here:
(I will NOT be liable to you for any damages, including without limitation, direct, indirect, special, incidental, punitive, or consequential damages that may occurs to your product)