Hi there,
I have hw420 and hw421 versions but unfortunately with broken fw (someone tried to install pr1.2 on hw420 and 421 just password locked)
Luckily both are visible to flasher, but I'm struggling to find a fw that will run on this hw without faking a newer hw.

I suspect that RX-71+RM-660+RM-680+RM-690+RM-696_HARMATTAN_0.2010.35-5.001_RD_001 or 0.1000.38-3.REQ.386887.001 might be fine, so if anyone still has them and wants to share files please pm me.