Hi Leenam1203,
Thank you for visiting Sony Community!
This is usually done in BIOS. If the BIOS of your unit does not have the option under Boot, then we cannot change it.
For further assistance regarding your concern, please contact the Sony offices/Sony representative offices nearest to your place of residence in Asia Pacific region http://www.sony-asia.com/countryselector.html?hpid=countryselector:AsiaPacific. Due to proximity, they are in a better position to respond to your questions or concerns.
Regards,
Vincent
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