update cisco ios via xmodem

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Use this field to input your configuration steps or
　　problem resolution.
　　The steps below outline how to connect and download another image using
　　XMODEM through the console port of the router.
　　How to download an image using xmodem when routers 3600 and 2600 goes into
　　ROMMON prompt?
　　Problem:- The router is in ROMMON prompt and when it is reloaded it again
　　goes into ROMMON prompt.
　　Solution:-
　　To solve the above problem, you can download an image to the 2600 and 3600
　　using the console port of the router.
　　The procedure uses the default console speed of 9600 bits per second.
　　Xmodem is a slow transfer protocol. Increasing the console speed (which is
　　possible
　　for the Cisco 2600 and 3600 series routers) helps decrease the time it
　　takes to do the xmodem file transfer.
　　3600 / 2600 in rommon
　　1- rommon > b ---------- to boot first image in flash mem
　　2- rommon > dir flash: ---------- list the files on the device
　　3- rommon > meminfo ---------- to see memory information
　　You are in rommon and
　　1- when "b" is typed the router comes back in rommon.
　　2- dir flash: reveals an invalid check sum.
　　3- So the last solution is to download an image using xmodem
　　When in ROMMON mode, follow the procedure below Using the ROMMON confreg
　　utility.
　　rommon 2 > confreg
　　do you wish to change the configuration? y/n [n]: y
　　enable "diagnostic mode"? y/n [n]: n
　　enable "use net in IP bcast address"? y/n [n]: n
　　disable "load rom after netboot fails"? y/n [n]: n
　　enable "use all zero broadcast"? y/n [n]: n
　　enable "break/abort has effect"? y/n [n]: n
　　enable "ignore system config info"? y/n [n]: n
　　change console baud rate? y/n [n]: y
　　enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400
　　4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [7]: 7
　　change the boot characteristics? y/n [n]: y
　　enter to boot:
　　0 = ROM Monitor
　　1 = the boot helper image
　　2-15 = boot system
　　[0]: 0
　　Configuration Summary
　　enabled are:
　　load rom after netboot fails
　　console baud: 115200
　　boot: the ROM Monitor
　　do you wish to change the configuration? y/n [n]: n
　　You must reset or power cycle for new config to take effect
　　rommom 2 > reset
　　The next step is to open a new hyperterminal with settings as follows,
　　Bits per second - 115200
　　Data bits - 8
　　Parity - None
　　Stop bits - 1
　　Flow control - Hardware
　　After setting the hyperterminal you get a rommon prompt, and type the
　　xmodem command. Before typing an xmodem command there should be a software
　　image
　　residing in your terminal or your local C drive.
　　rommon 2 > xmodem -c c3640-i-mz.121-7.bin
　　Do not start the sending program yet...
　　File size Checksum File name
　　4936800 bytes (0x4b5460) 0x2dd7 c3640-i-mz.121-7.bin (bad checksum:
　　0x13eb)
　　WARNING: All existing data in flash will be lost!
　　Invoke this application only for disaster recovery.
　　Do you wish to continue? y/n [n]: y
　　Ready to receive file c3640-i-mz.121-7.bin ...
　　After the above message appears u have to download the file using xmodem,
　　the procedure is as follows,
　　1) Go to Hyperterminal, click Transfer
　　2) Click on send file
　　3) click on browse -------- look for the file name in your local "C"
　　drive
　　4) Below filename field is Protocol ------- change it to xmodem
　　5) And then clik on send
　　After some time the router will reload itself and will ask you "Press
　　return to get stated"
　　Router> en
　　Router#conf t
　　Enter configuration commands, one per line. End with CNTL/Z.
　　Router(config)#conf t
　　Router(config)#config-register 0x2102
　　Router(config)#line con 0
　　Router(config-line)# speed 9600 --------- Change the speed of the
　　console port to 9600
　　Then go to Hyperterminal and change baud rate to 9600 in your terminal.
　　Router(config-line)#ctrl z
　　Router #write mem
　　Router #reload
　　


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