Changing Back to Original CISCO IOS

I recently updated my 1721 ios and now my serial interface doesn't show up as a configurable.  Prior to the upgrade I could configure the interface.  How do I get back to my original ios?
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Pete LongTechnical ConsultantCommented:
if you didnt back up the IOS (to a TFTP server for example) before you upgraded you will need to contact Cisco, or a Cisco reseller to get an older version of the IOS


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echunnAuthor Commented:
which I didn't....thanks!
Pete LongTechnical ConsultantCommented:
:( Sorry I used to send people cisco IOS's as I have a TAC account at Cisco and can download them, till I got shouted at and told this was in breach of my cisco account :(
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echunnAuthor Commented:
I'm contacting them now......Hey I wont say anything! :)
echunnAuthor Commented:
How do you retrieve IOS  from a router?
Pete LongTechnical ConsultantCommented:
fist determins the IOS used

   Router3#show flash
   File  Length   Name/status
     1   10218508  /c2500-js-l_120-8.bin
   [10316471 bytes used, 6460745 available, 16777216 total]
   16384K bytes of processor board System flash (Read ONLY)

Backup IOS
Use the show version command to determine the version of the IOS on the router and the filename of the image, you already got the size of flash from the previous command.

   Router_1#show version
   ROM: System Bootstrap, Version 12.0, RELEASE SOFTWARE
   BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c)XB1,

   Router_1 uptime is 11 minutes
   System restarted by power-on
   System image file is c2500-js-1_120-8.bin, booted via flash

   Bridging software.
   X.25 software, Version 3.0.0.
   1 Ethernet/IEEE 802.3 interface(s)
   2 Serial network interface(s)
   32K bytes of non-volatile configuration memory.
   8192K bytes of processor board System flash (Read ONLY)

   Configuration register is 0x2102


Use the following command to copy the IOS from flash to a TFTP server:

   Router3#copy flash tftp
   System flash directory:
   File  Length   Name/status
      1   6078548  c2500-js-l_120-8.bin

   [6078612 bytes used, 2309996 available, 8388608 total]
   Address or name of remote host []?
   Source file name? c2500-js-l_120-8.bin
   Destination file name [c2500-js-l_120-8.bin]?
   Verifying checksum for 'c2500-js-l_120-8.bin' (file # 1)...  OK
   Copy 'c2500-js-l_120-8.bin' from Flash to server
   as 'c2500-js-l_120-8.bin'? [yes/no]yes
                      [cut for brevity]

   Upload to server done
   Flash copy took 0:01:44 [hh:mm:ss]

TFTP doesn't allow directory browsing or user authentication, so the file is put in the default directory of the TFTP server.

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