Correct package for RB450Gx4

What would be the correct install package for RB450Gx4. Misbe or Arm? The description says RB4XX for misbe, but I heard this has an arm processor inside. I will not take any risk before I figure it out.

Poting

Wrong firmware is not a malfunction. Upgrade will not be done.

If you login by winbox, what you see in top window border? Or in menu /system/packages? It is ARM.

Thanks. Now I know it’s arm based.