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I am facing problem in update the IOS of Cisco 7304 router. I am upgrading from 12.4(24)T2, to 15.2(4)S7 this. but I was boot from this version 15.2(4)S7 it booted proper from flash. But when I put the command show version it is showing

YLINX-EDGE-LHE-01#sh version
Cisco IOS Software, 7200 Software (C7200P-SPSERVICESK9-M), Version 12.4(24)T2, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Mon 19-Oct-09 23:55 by prod_rel_team

ROM: System Bootstrap, Version 12.4(12.2r)T, RELEASE SOFTWARE (fc1)
BOOTLDR: Cisco IOS Software, 7200 Software (C7200P-BOOT-M), Version 15.2(4)S7, RELEASE SOFTWARE (fc4)

YLINX-EDGE-LHE-01 uptime is 30 minutes
System returned to ROM by power-on
System image file is "disk0:c7200p-spservicesk9-mz.124-24.T2.bin"

further

YLINX-EDGE-LHE-01#sh bootvar
BOOT variable =
CONFIG_FILE variable does not exist
BOOTLDR variable =
WARM_REBOOT variable = FALSE
Configuration register is 0x2102
........

here flash have both IOS can I delete the previous IOS from flash

YLINX-EDGE-LHE-01#show flash

-#- ED ----type---- --crc--- -seek-- nlen -length- ---------date/time--------- name
1   .. image        64588721  A152DC   27 10048092 Jan 24 2019 01:36:11 +00:00 c7200p-boot-mz.152-4.S7.bin
2   .. image        33A24A92 2DBF9C4   38 37398120 Jan 24 2019 01:44:20 +00:00 c7200p-adventerprisek9-mz.152-4.S7.bin

18089532 bytes available (47446468 bytes used)
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    You need to set the boot variable by using the following command in config mode: boot system flash:c7200p-adventerprisek9-mz.152-4.S7.bin OR boot sytem bootdisk:c7200p-adventerprisek9-mz.152-4.S7.bin - you can check with the bootvar command after setting it show bootvar. – user36472 Jan 25 at 9:17
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    Please let me know if it works, then i'll post it as an answer. – user36472 Jan 25 at 12:00
3

Don't delete the IOS from the flash>

PLease share the output

# show boot -- check the NEW IOS is in the next reboot if not do below command.

conf t 
boot system flash:IOS image name.bin

Save the config

check the show boot

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