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Hi Sam,
” device does not contain a valid magic number ” means that the image either in flash or on your tftp server is corrupted and you will not be able to run it…. Download a fresh image and use the xmodem process making sure you change the line speed to the max allowed by you router.
Cheers, Dan
On Wed, May 14, 2008 at 8:35 AM, Sam K. wrote:
> Hi, I have 2 3640 Routers and both complaining with invalid magic number. > I > tried the below steps but after copying the files in step 4, it’s coming > back to rommon mode. I am trying to recover this mode for setting up my > lab > and so far unsuccessful. Can somebody help me? > rommon 2 > boot > device does not contain a valid magic number > boot: cannot open “flash:” > boot: cannot determine first file name on device “flash:” > > Thanks in advance! > ======================================================== Xmodem Procedure > for Downloading a Cisco IOS Software Image onto a Cisco 3600 Router > > Use this *xmodem* procedure in order to download a Cisco IOS software > image > onto a Cisco 3600 Series Router. > > The standard procedure uses the default console speed of 9600 bits per > second. Xmodem is a slow transfer protocol, and the transfer of a file as > large as a Cisco IOS software image could take an unacceptably long time. > An > increase to the console speed on the 3600 router helps decrease the time > it > takes to do the xmodem file transfer. > > When in ROMMON mode, complete this procedure using the ROMMON *confreg > * utility. > 1. > > 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* > > 2. > > Open a new hyperterminal with these settings: > > Bits per second - 115200 > Data bits - 8 > Parity - None > Stop bits - 1 > Flow control - Hardware > > 3. > > After setting the hyperterminal, you receive a rommon prompt. Enter > the *xmodem* command. Before you enter an *xmodem* command, there > should be a software image residing in your terminal or your local hard > 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 (0×4b5460) 0×2dd7 c3640-i-mz.121-7.bin (bad > checksum: 0×13eb) > > 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 … > > 4. > > After this message appears, you have to download the file using * > xmodem* and this procedure: > 1. > > Go to Hyperterminal and click the *Transfer* menu. > 2. > > Select *Send File*. > 3. > > In the dialog box which appears, click on browse and look for > the file name on your local hard drive. > 4. > > Under the filename field is the Protocol drop-down box. Choose * > Xmodem*. > 5. > > Click *Send* to initiate the file transfer. > 5. > > After the transfer completes, the router will reload itself. When the > reload completes, press the *return* key to be taken to a prompt and > to reset the configuration register and the console line speed. > > Router> *enable* > Router#*configure terminal* > Enter configuration commands, one per line. End with CNTL/Z. > Router(config)#*configure terminal* > Router(config)#*config-register 0×2102* > Router(config)#*line con 0* > Router(config-line)# *speed 9600* > > 6. > > Upon changing the console speed, you will lose connectivity. Go to > your terminal program, change the baud rate to 9600, and reconnect to > the > router console. > > Router(config-line)#*ctrl z* > Router #*write mem* > Router #*reload* > > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html