Same problem here. Have a RB1000 that runs 6.0beta2 and needs downgrading to 5.21. /system package downgrade didn't work at all - I tried different NPKs to no avail. The RB just spat out heaps of error messages and then the router booted into 6.0b2 anyways. So I tried Netinstall on my Win7 64 bit ma...