Hello Mike,
RT chip also has a bootloader that can use the USB HID and UART to update the firmware. About the software to interact with this bootloader, you can use the manufacturing tool, this can be downloaded with the SDK of the RT, you just need to select "mcu-boot" under middleware on the SDK builder.
I think this community document might be helpful: https://community.nxp.com/docs/DOC-341317
Regards,
Victor