Decrypt TLSv1.2 in Stage 1

HI Team,
Please can you help me for the method to decrypt capture packet with wireshark in “stage 1 installation” ?
Thank you a lot

Maybe try this method?

Hi calee,
This method is valid with stage 3, but in my case, I’m using stage 1. so I couldn’t decrypt or found the xxsslkey.log file.