https://community.extremenetworks.com/t5/extremeswitching-other/unable-to-update-old-firmware-v11-2-0-15-to-v12-5-1-6/m-p/12171#M3199 David is correct. the highest version that is supported on the x450-24t is EXOS 15.3 Mon, 11 Sep 2017 18:35:00 GMT Ron_Huygens 2017-09-11T18:35:00Z https://community.extremenetworks.com/t5/extremeswitching-other/unable-to-update-old-firmware-v11-2-0-15-to-v12-5-1-6/m-p/12169#M3197 During a recent Firmware upgrade on an x450-24t switch, I encountered a problem updating the firmware from v11.2.0.15 to v12.5.1.6. I am getting the following error message:<BR /> <BR /> <B>Installing to Switch........................Error: Failed to install image - This hardware is not supported for this software release. Please see the ExtremeXOS Concepts Guide for information on installing a newer software release. See the Release Notes for your hardware to verify the supported ExtremeXOS releases.</B><BR /> <BR /> I currently have installed --<B></B><BR /> <BR /> <B>Router1009_Lab1_iDMZ.3 # show version<BR /> Switch : 800143-00-03 0525G-00010 Rev 3.0 BootROM: 1.0.0.8 IMG:<BR /> XGM-2xn-1 :<BR /> Image : ExtremeWare XOS version 11.2.0.15 v1120b15 by release-manager on Fri Apr 1 18:40:23 PST 2005<BR /> BootROM : 1.0.0.8</B><BR /> <BR /> Is there an intermediate step/version I should install prior to installing v12.5.1.6?<BR /> Please describe the firmware update path for this device in detail. <BR /> Mon, 11 Sep 2017 18:29:00 GMT https://community.extremenetworks.com/t5/extremeswitching-other/unable-to-update-old-firmware-v11-2-0-15-to-v12-5-1-6/m-p/12169#M3197 Bobby_Johnson 2017-09-11T18:29:00Z https://community.extremenetworks.com/t5/extremeswitching-other/unable-to-update-old-firmware-v11-2-0-15-to-v12-5-1-6/m-p/12170#M3198 <P class="fancybox-image"><span class="lia-inline-image-display-wrapper" image-alt="4abfb08a98264d449a0a657edbaa589b_RackMultipart20170911-45305-oxr99g-Capture1_inline.png"><img src="https://community.extremenetworks.com/t5/image/serverpage/image-id/3540i74B02A16CC775977/image-size/large?v=v2&amp;px=999" role="button" title="4abfb08a98264d449a0a657edbaa589b_RackMultipart20170911-45305-oxr99g-Capture1_inline.png" alt="4abfb08a98264d449a0a657edbaa589b_RackMultipart20170911-45305-oxr99g-Capture1_inline.png" /></span></P><BR /> <BR /> 12.5 is not supported on X450, from what I see here. Mon, 11 Sep 2017 18:35:00 GMT https://community.extremenetworks.com/t5/extremeswitching-other/unable-to-update-old-firmware-v11-2-0-15-to-v12-5-1-6/m-p/12170#M3198 davidj_cogliane 2017-09-11T18:35:00Z https://community.extremenetworks.com/t5/extremeswitching-other/unable-to-update-old-firmware-v11-2-0-15-to-v12-5-1-6/m-p/12171#M3199 David is correct. the highest version that is supported on the x450-24t is EXOS 15.3 Mon, 11 Sep 2017 18:35:00 GMT https://community.extremenetworks.com/t5/extremeswitching-other/unable-to-update-old-firmware-v11-2-0-15-to-v12-5-1-6/m-p/12171#M3199 Ron_Huygens 2017-09-11T18:35:00Z