VSS IOS Upgrade problem

[Free Bird]

Guys , m having a problem when upgrading the IOS on my VSS

i am using the  following page for instructions.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-1SY/config_guide/sup2T/15_1_sy_swcg_2T/virtual_switching_systems.html#pgfId-1341260

the problem is that , after putting the 'boot system flash''clearing it and setting up confreg ; the switches still bootup in previous image.

Previous version = Version 15.1(2)SY2

I want to upgrade to = 15.1(2)SY4a

I have also tried ISSU and this thing comes up : Current running image does not match bootvar on Active unit

my bootvar is :

sh bootvar
BOOT variable = bootdisk:s2t54-boot-mz.SPA.151-2.SY4a.bin,1;s2t54-boot-mz.SPA.15
1-2.SY4a.bin,1;
CONFIG_FILE variable =
BOOTLDR variable =
Configuration register is 0x2102

Standby BOOT variable = bootdisk:s2t54-boot-mz.SPA.151-2.SY4a.bin,1;s2t54-boot-m
z.SPA.151-2.SY4a.bin,1;
Standby CONFIG_FILE variable =
Standby BOOTLDR variable =
Standby Configuration register is 0x2102

sh ver :

Cisco IOS Software, s2t54 Software (s2t54-IPSERVICESK9-M), Version 15.1(2)SY2, R
ELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport

[InayathUlla Sharieff]

Can you please post the below command:

show run | be boot

show run | in boot

Regards

Inayath

[Free Bird]

sh run | in boot
boot-start-marker
boot system flash bootdisk:s2t54-boot-mz.SPA.151-2.SY4a.bin
boot system flash s2t54-boot-mz.SPA.151-2.SY4a.bin
boot-end-marker
diagnostic bootup level minimal

--------------

show run | be boot                              
boot-start-marker
boot system flash bootdisk:s2t54-boot-mz.SPA.151-2.SY4a.bin
boot system flash s2t54-boot-mz.SPA.151-2.SY4a.bin
boot-end-marker

[InayathUlla Sharieff]

try removing this:-

no boot system flash s2t54-boot-mz.SPA.151-2.SY4a.bin

save the config and reboot.

I am assuming that the bootdisk & image which is been downloaded is good.(Verfiy the image once if you can).

HTH

[Free Bird]

no boot system flash s2t54-boot-mz.SPA.151-2.SY4a.bin

doesnot make any difference

i also checked the image using the 'verify' command , and all had gone good