Please follow the next steps to upgrade the entire stack:
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If master switch flash (flash 1) is master here with updated IOS 15.0 Version.
1- Delete the old IOS from switches 2,3 & 4
switch#delete flash2:<old_image>
switch#delete flash3:<old_image>
switch#delete flash4:<old_image>
2- Now we have enough space to upload the new code for the two members. So please upload the image into the flash
3- Verify the integrity of the new image
switch#verify flash:/<new_image>
4- Change the boot variable for the entire stack
switch(config)#boot system switch all flash:<new_image>
Note: If the above is not supported we may need to do it manually for each member as like below
switch(config)#boot system switch 2 flash:<new_image>
switch(config)#boot system switch 3 flash:<new_image>
switch(config)#boot system switch 4 flash:<new_image>
5- For both cases we need to save the changes
switch#wr
6- Need to check that we have the correct boot statement on each switch
switch#show bootvar
7-We can reload the entire stack, after deleted old image, uploaded new one, verified the integrity of the IOS, corrected boot statement.
Switch#reload slot 3
Just for theory --> Copying the IOS from TFTP server instead from inside the switch.
IOS File will be --> 16 to 17 Mb
check the space by the command --> dir flash1:
If full then delete the IOS --> Switch#delete flash1: flash:c3750-i5-mz.XXX.bin
If space exist in Flash then copy IOS --> copy tftp: flash1: Address or name of remote host [172.22.1.165]?
Source filename [c3750−advipservicesk9−mz.122−25.SEE2]? c3750−advipservicesk9−.122−25.SEE2.bin
Set the IOS and reload --> Switch#boot system switch 1 flash:/c3750−advipservicesk9−mz.122−25.SEE2.bin
To Make the Switch as Master :
Switch(config)# switch 3 priority 15
Priority can be range from 1 to 15
Switch#write memory
Switch#reload slot 3
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