Dell POWEREDGE M1000E - Manual (Page 151)

Managing a Switch Stack 151
Stack Firmware Synchronization
Use the Stack Firmware Synchronization page to control whether the
firmware image on a new stack member can be automatically upgraded or
downgraded to match the firmware image of the stack master.
To display the Stack Firmware Synchronization page, click System → Stack
Management → Stack Firmware Synchronization in the navigation panel.
Figure 8-6. Stack Firmware Synchronization