How to upgrade 3750x switch with stack?

I have two 3750x switch with stack , cai i upgrade their ios in one CLI or i have to take their stack off and up grade their ios one by one
tonylee777Asked:
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Craig BeckCommented:
Make a note of the issue with 2-switch stacks in this link too...

https://supportforums.cisco.com/thread/2117754
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AkinsdNetwork AdministratorCommented:
Research Rolling Stack Upgrade (RSU)

This lets you upgrade both switches as 1

See the steps in the link below
https://supportforums.cisco.com/thread/2186032
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SouljaCommented:
Even better.
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