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Restore or Install new flash from TFTP server to Cisco Router. In this restore process existing IOS will erased completely before install the new IOS image file. Make sure you have a backup.

Requirement:
- PC with TFTP Server that have IOS (IP Address 192.168.1.1 and IOS image file d1600.bin).
- Network connection to Cisco Router.
- Make sure your new IOS is match for your Cisco Router version.

Router>
Router>enable
Password:
Router#
Router#copy tftp flash
Address or name of remote host []? 192.168.1.1
Source filename []? d1600.bin
Destination filename [d1600.bin]?
Accessing tftp://192.168.1.21/d1600.bin…
Erase flash: before copying? [confirm]
Erasing the flash filesystem will remove all files! Continue? [confirm]
Erasing device… eeeeeeeeeeeeeeee …erased
Erase of flash: complete
Loading d1600.bin from 192.168.1.1 (via Ethernet0): !!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 3289170/6578176 bytes]
Verifying checksum… OK (0xB6BD)
3289170 bytes copied in 89.272 secs (36956 bytes/sec)
Router#

Finish

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