topic Firmware Request & Stacking Query: Summit X450e-48p (Running 15.2.1.5 and 12.4.2.17) in ExtremeSwitching (EXOS/Switch Engine)

Firmware Request & Stacking Query: Summit X450e-48p (Running 15.2.1.5 and 12.4.2.17)

antt1995 — Wed, 02 Sep 2026 11:49:39 GMT

Hello everyone,

I recently acquired two legacy Summit X450e-48p switches for a project. They are currently running significantly different firmware versions:

Switch 1: ExtremeXOS 15.2.1.5
Switch 2: ExtremeXOS 12.4.2.17

Because these models are End-of-Life (EOL) and the files are no longer hosted on the official Extreme Portal, I am looking for assistance with the following:

Firmware Archive Request: Does anyone happen to have a copy of the final stable release for this hardware generation, ExtremeXOS 15.3.5.2-patch1-19 (along with its matching SSH .xmod package)? Alternatively, a copy of 15.2.1.5 would also work perfectly to align the pair.
Firmware Synchronization: If the files cannot be sourced externally, is there an alternative local method to force these two specific versions to synchronize?
Stacking Behavior: I am planning to purchase stacking cables for these units. If I physically stack them, will the Master switch automatically force a firmware synchronization/downgrade to the backup node across the stack link, or does EXOS require matching firmware versions before a stack can successfully form?

Any help, file shares, or documentation guidance would be greatly appreciated.

Thank you!

Re: Firmware Request & Stacking Query: Summit X450e-48p (Running 15.2.1.5 and 12.4.2.17)

FredrikB-NN2 — Wed, 02 Sep 2026 13:14:40 GMT

A pair of X450-G2-48P-10GE4 for under $80 each would have been a better starting point. EXOS matching is a requirement to form a stack, so there is problem #1. I don't think you can copy the EXOS files from one switch to another. Someone please correct me if I'm wrong. Problem #2 is the built-in battery that retains the config and keeps track of time when powered off. It is replaceable, but likely costs more than you paid for those switches. #3 is the internal power stabilization. Chances are you have bad condensers on the motherboard that will start producing unstable voltage, causing the internal memory and CPU to go haywire. #4 is stacking cables which may also cost more than you already paid. The G2 can use the front panel SFP+ ports for stacking so any cheap DAC or SFP+ can be used.

Where are you located, EU, US...?

Re: Firmware Request & Stacking Query: Summit X450e-48p (Running 15.2.1.5 and 12.4.2.17)

antt1995 — Wed, 02 Sep 2026 17:41:22 GMT

Located in the UK.
#1 Okay
#2&3 Ah that could be a an issue, I am running these off a UPS so that should help them
#4 The Stacking cables I can get for £14 each for a 0.5m

I'm using about 30 ports on each switch for POE so some of the points you have raised could cause some issues,
I will have a Look at the G2 version and see if we can get that to Augment our setup