I sacrificed one RB333 and it’s not good. After upgrade from 6.49.2 it fails to boot with same “kernel out of range” as yours. It can be fixed by upgrading firmware as described in v7.1beta4 on RB600A thread (RB333 is mpc8323; I used upgrade over serial port, since the board was already bricked), and then it boots. Problem is, after that, all ethernet ports are dead, autonegotiation is successful, it’s connected at 100M full duplex, I see rx traffic, but zero tx, router doesn’t send anything, no matter what I do. And no, you don’t need to worry about memory, 27MB free, no problem there. But those ethernets ruin the fun.