3DR Iris+ with PX4. I installed the wrong firmware

I have a 3DR Iris+ and installed the wrong firmware.
I installed the firmware for pixhawk1
I need to re install with PX4 firmware.
Could anyone assist me with this?

I am trying to use my laptop for a command center and my s20 ultra to control my gopro max I am going to mount.
I needed this thing flying like yesterday, I have a client waiting.

Thank you for your time.