BIOS Secure boot not being accessible to change from "Disabled" to "Enabled"

[S_8230]

 

When I try to enable secure boot in my consumer BIOS, I can't access it. Is there any way to change that? I'm trying to enable the secure boot option. I've already checked an article about changing it however my "Platform mode" is not set to "Deployed", is there a method to change that? 

[Falcon_ASUS]

@S_8230 
Could you please let me know the complete model name of the laptop you are using? 
And what is the current BIOS version you are using? 
Thank you.

[S_8230]

Sure! Sorry for the delayed reply. The model is TP3402ZA and the BIOS is TP3402ZA.309 

[Falcon_ASUS · Accepted solution]

@S_8230 
Please go to the Key Management submenu in the image and select "Restore Factory Keys". Then, save the BIOS settings and exit. After restarting, it will be enabled. Thank you.

[S_8230]

Thank you so much but will I lose any of my data on my laptop?