Problem in upgrading IOS version 15.0-SE5 to 12.2-SE12

[Aida Hadad]

hi guys,

I've just started working in company which I should upgrade Switch IOSs based on Cisco website recommendations.

Among the all Switches which we upgraded, One of them is 2960 which runs IOS version 15.0(2)SE5.

Based on Cisco recommendation I wanted to change it to version 12.2(55)SE12 but during boot up it fails .

Can we change IOS from 15 to 12?

What might be its problem?

It must to mention that I don have any log right now but I remembered it passed the post procedures and hang right CPU .. but requirement for our devices is OK .DRAM 64 flash 32

[ysotocob]

I decoded the information from the crash and I think that at this point you figured it out that a hardware failure was the root cause for the crash.
The device was trying to initiate the STP initial subsystem but it was not able to do it.
The specific part of the hardware part that is failing could not be determined but open a ticket with Cisco TAC to start the replacement process.