TDA4VM: how to used efuse writter tool ?

Part Number: TDA4VM

Hello,

I just got the security tool from https://www.ti.com/securesoftware/docs/securesoftware

regarding the 

as mentioned in the document:

Welcome to the TI OTP Keywriter Software add on package!!
This package installs over the General Purpose PDK package available on ti.com

To get started please follow the below steps:

1. Install the Processor SDK RTOS from ti.com from the link here:
www.ti.com/.../

NOTE: This package has been validated with Processor SDK RTOS 08_00_00 version 
and is the minimum SDK version required to run the OTP keywriter software. 
For any later SDK version, update the version in the path accordingly.

2. Once you have this installed, take the installer of the keywriter package and install this in the folder:

<Your SDK Installation Directory>/pdk_jacinto_08_00_00

3. Copy the OTP keywriter firmware `ti-fs-keywriter.bin` file to 

<Your SDK path>/pdk_jacinto_08_00_00/packages/ti/boot/keywriter/tifs_bin/j721e/ti-fs-keywriter.bin

4. Copy the TIFEK Public key `ti_fek_public.pem` file to 

<Your SDK path>/pdk_jacinto_08_00_00/packages/ti/boot/keywriter/scripts/ti_fek_public.pem

3. For any queries, please post your queries on e2e.ti.com

if I want to write key to efuse. I need to build image with the given ti-fs-keywriter.bin ?
or is there a seperate tool for writting pub key to efuse ?
and should I replace the given key ti_fek_public.pem with my own pub key ?

thanks.