Cisco IOS upgrade

Hi Guys,
I just used the following instructions to upgrade the IOS on a Cisco 3750 swtich.
http://www.thegeekstuff.com/2011/06/upgrade-cisco-ios-image/

And when I ran reload, the switch began to make a very loud noise,
And the console shows a series of letters particularly these

spssssssssssspssssss

And it's been like that for like 5 minutes.
Is this normal?
cargexAsked:
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cargexAuthor Commented:
Front-end Microcode IMG MGR: Preparing to program device[0]....

And is back to

sssssssspsssssspssssssss


Can anyone please help me!!!!
Wayne88Commented:
Seems like you put the wrong image on the switch

"With new IOS version you will see microcode getting updated which will take 30-45 minutes when switch booted first time but switch will take normal time to boot afterwards. Actually, The switches have a small MCU(MicroController Unit) to offload processing of some of the hardware interfaces like POE , Fan, power supply etc. (the actual details vary by SKU).Programming front end

microcode should only happen once when upgrading to a higher version with newer microcode.

So Lets wait once switch booted with wrong IOS, then change the IOS image."
cargexAuthor Commented:
The IOS isn't wrong, because it is the same version that is running in other 3 switches that are currently in production environment, but I didn't upgrade those, they were like that from before they were my responsibility.

But thinking about what your are saying the upgrade was from IOS 12 to IOS 15, so I think that's why the microcode was updated, and now all the noise and the 30 minutes it took makes sense.

At the present time, the switch finished with the upgrade and now seems to be running normally.

Switch>show switch
Switch/Stack Mac Address : d8b1.9054.c080
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
*1       Master d8b1.9054.c080     1      3       Ready



Switch#show ver
Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(2)SE8,
RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 13-May-15 22:53 by prod_rel_team

ROM: Bootstrap program is C3750E boot loader
BOOTLDR: C3750E Boot Loader (C3750X-HBOOT-M) Version 15.2(3r)E, RELEASE SOFTWARE
 (fc1)

Switch uptime is 8 minutes
System returned to ROM by power-on
System image file is "flash:c3750e-universalk9-mz.150-2.SE8.bin"

Do you agree with my assessment of the current situation?
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cargexAuthor Commented:
Wayne88, can you please confirm or refute my conclusion?
I would like to close this question today.
Thanks.
pgolding00Commented:
yes, it looks fine to proceed. its running version 15.0 and has been up and working for 8 minutes.

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cargexAuthor Commented:
Thanks guys.
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