Hi Edouard, You need to update to 9.10 first and then to the latest. Page 19 [URL] NOTE: If you are upgrading from Dell EMC Networking OS version 9.9(0.0P18) or earlier, you cannot directly upgrade to version 9.14(2.8) or above. Upgrade to version 9.10(0.0) or above first and then upgrade to the required version.
Dear Community,    I have to upgrade to switches CORE (S4048-ON) configured with a VLT. I have the release 9.9(0.0P9) on these 2 switches. #show os-version RELEASE IMAGE INFORMATION :---------------------------------------------------------------------Platform Version Size ReleaseTimeS-Series:SK-ON 9.9(0.0P9) 62933943 Feb 4 2016 09:22:35 TARGET IMAGE INFORMATION :---------------------------------------------------------------------Type Version Target checksumruntime 9.9(0.0P9) Control Processor passed BOOT IMAGE INFORMATION :---------------------------------------------------------------------Type Version Target checksumboot flash 3.21.2.2 Control Processor passed BOOTSEL IMAGE INFORMATION :---------------------------------------------------------------------Type Version Target checksumboot selector 3.21.0.4 Control Processor passed FPGA IMAGE INFORMATION :---------------------------------------------------------------------Card FPGA Name Versionstack-unit 1 S4048-ON SYSTEM CPLD 11stack-unit 1 S4048-ON MASTER CPLD 9stack-unit 1 S4048-ON SLAVE CPLD 4 I see on [URL] Web site the latest FTOS release is the 9.14.2.8 , can I upgrade without intermediate steps to the latest release ?    Do you have any advise on this ?  Thanks a lot for your help   Have a nice weekend ! Best Regards, Edouard Fazenda.
Upgrade of Force10 S4048-ON from very old release 9.9.0(P9) to the latest