Unable to stack 3750 and 3750X

[premsmily]

I am unable to stack the below switches. I am getting error of incompatible software. Please advise. I am trying to add to 3750x which is the higher version.

Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
*    2   26     WS-C3750-24P       12.2(35)SE5             C3750-IPBASE-M

Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 54    WS-C3750X-48P      12.2(55)SE8           C3750E-UNIVERSALK9-M

[Leo Laohoo]

You will need to upgrade the WS-C3750-24P to IOS version 12.2(55)SE8 before you can stack them. 

The 3750X cannot go any lower than 12.2(55)SE.

[premsmily]

Thank you Leo. We will try that.

[Joseph W. Doherty]

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Posting

Two additions to what Leo has already noted.

Would suggest moving to (55)SE9, and believe your 3750X will need a IPBase or IPServices license.  (I.e. if 3750X is licensed for LANBase, it may not work.)

[premsmily]

Its IPbase license..not LANbase

[premsmily]

You mean to say that 3750X cannot identify any IOS lower than 12.2(55)SE. and in stack it cannot upgrade the IOS lower than that right...