8. During the boot process the image is copied first on to the memory(RAM) and is installed from memory(RAM). Once it is insalled from memory, it will copy the image back on to disk0: and reload the device. Wait till you get the message "SYSTEM CONFIGURATION COMPLETED"
Output of show install active when in memory,
RP/0/RSP0/CPU0:ios#sh instal active <SNIP> Active Packages: mem:asr9k-mini-p-4.2.0
Output of show install active after image copied on to disk0:,
RP/0/RSP0/CPU0:ios#sh instal active <SNIP> Active Packages: disk0:asr9k-mini-p-4.2.0
9. Restore disk mirroring if it was disabled in step 6. To restore disk mirroring, use the mirror command in the global configuration mode. For more information on the mirror command, see the "Boot Commands on Cisco IOS XR Software" module in Cisco ASR 9000 Series Aggregation Services Router System Management Command Reference.
RSP-440 can boot from the USB front panel port like this: