Hi James,
Please refer: 1.2 Flash the Out-of-Box Demo
Download the S32K146EVB_OOBE_FreeMASTER_Firmware.srec from Software and Tools tab. Then drag and drop the downloaded image file into your S32K146EVB disk that is listed in your PC window.

Do not copy it in bootloader mode. This will cause your board to lose the application firmware.
Please refer to this post What is the power supply voltage range over which the S32K144EVB-Q100 can operate? to restore the application firmware. Please use: MSD-DEBUG-S32K146EVB-Q144_Pemicro_v121.SDA
Then you can drop S32K146EVB_OOBE_FreeMASTER_Firmware.srec into your S32K146EVB disk.
Please follow the S32K146EVB-QSG
At "Setup serial connection in the FreeMASTER tool" page, I think you can select automatically mode.
Setup communication automatically: Tools > Connection Wizard



Best Regards,
Robin
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