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How to flatten/upgrade my Cisco 4507R

EE

I am not sure which software downloads to get to properly upgrade my Cisco 4507R core switch.  Cisco lists many and I am uncertain what is necessary vs. nice to have.  I am guessing all I need to do is upgrade the Supervisor II+ with the latest, but even that has 8 choices for me to choose from.   Below is a 'show mod'.  If you could direct me to the correct file name it would be appreciated.  

Also, this core has redundant sups.  Each time I do a write erase or clear startup-config and erase cat4000_flash: all the stuff comes back!  From what I have read the deleted sup should sync with the standby sup and I should have these problems.  Again, you assistance is appreciated.

coreswitch#show mod
Chassis Type : WS-C4507R

Power consumed by backplane : 40 Watts

Mod Ports Card Type                              Model              Serial No.
---+-----+--------------------------------------+------------------+-----------
 1     2  Supervisor II+ 1000BaseX (GBIC)        WS-X4013+          JAE1114B779
 2     2  Supervisor II+ 1000BaseX (GBIC)        WS-X4013+          JAE1115C4HC
 3    48  10/100/1000BaseT (RJ45)                WS-X4548-GB-RJ45   JAE1121HR8B
 4    48  10/100/1000BaseT (RJ45)                WS-X4548-GB-RJ45   JAE1121HRAS
 6     6  1000BaseX (GBIC)                       WS-X4306-GB        JAE11129QX1
 7     6  1000BaseX (GBIC)                       WS-X4306-GB        JAE11129QPD

 M MAC addresses                    Hw  Fw           Sw               Status
--+--------------------------------+---+------------+----------------+---------
 1 001b.d473.b0c0 to 001b.d473.b0c1 4.3 12.2(20r)EW1 12.2(25)EWA8     Ok      
 2 001b.d473.b0c2 to 001b.d473.b0c3 4.3 12.2(20r)EW1 12.2(25)EWA8,    Ok      
 3 001b.d47e.82c0 to 001b.d47e.82ef 2.4                               Ok      
 4 001b.d4b6.7d10 to 001b.d4b6.7d3f 2.4                               Ok      
 6 0016.c76e.af18 to 0016.c76e.af1d 4.3                               Ok      
 7 000e.83a1.a784 to 000e.83a1.a789 4.3                               Ok      

Mod  Redundancy role     Redundancy mode     Redundancy status
 --More--         ----+-------------------+-------------------+-------------------
 1   Active Supervisor   SSO                 Active            
 2   Standby Supervisor  SSO                 Standby hot        

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JohnDemerjian
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JohnDemerjian
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JohnDemerjianAuthor Commented:
No that isn't really what I needed.  My problem turned out to be that instead of write erase and reload I needed write erase and "redundancy reload shelf".  that allowed me to flatten it and return to factory.  then i had to manually run the "squeeze" command which I hadn't done before.  then i was confused by which of the 10 differrent software upgrades to apply.  I got it worked out.  thanks.
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JohnDemerjianAuthor Commented:
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