Upgrading IOS on VSS Switch (

Hi All,
I would like to upgrade IOS on 6509-E VSS switch. My SUP engine is Catalyst 6500 Series Supervisor Engine 2T. 
Current OS : s2t54-advipservicesk9-mz.SPA.150-1.SY3.bin
To Upgrade OS : s2t54-advipservicesk9-mz.SPA.150-1.SY7a.bin
Procedure is as below.
=================================================
1.  Copy the IOS to primary supervisor card using the command "copy tftp:/IOS.bin bootdisk:"
2.  Copy the IOS to the SECONDARY supervisor card using the command "copy tftp:/IOS.bin slave-bootdisk:"
3.  Remove the old boot variable string using the command "NO boot system flash bootdisk:OLD_IOS.bin"
4.  Add the new IOS file to the boot variable string using the command "boot system flash bootdisk:NEW_IOS.bin"
5.  Config register is already 0X2102 so no need to change it. Reload after this.
=================================================
Its there any other thing we may need to check because we do have lots of line card and incase it is not supporting new IOS . Also need advice if  any other step missing in upgrading procedure.
With Thanks.

Your procedure is what I always use.  
You can optionally check the MD5 hash value of the IOS file you've downloaded from the Cisco website against the MD5 hash value found in the Cisco website. 

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