What's the step to upgrade XOS from 12.5.4.5 to 16.2.3.4 patch 1-14 on summit x480-48t

[Da_Mon]

I have a few X480 extreme switches here at Intel and want to upgrade the OS on them
I already got summitX480-16.2.3.5-patch1-14.xos from extreme website but during downloading it to switch (after tftpd32 finished its job) switch says "Error: File could not be unwrapped"
I thought maybe there is an upgrading step probably to a lower version first that I'm missing
Can someone help me out?

[Da_Mon]

No, I thought it's optional to use!

[Da_Mon]

i finally installed xos, no need to use VR,
Thank you though

[Jeremy_Gibbs]

No, if you don't specify a VR, it won't be able to download the file. In that release anyway...

[Jeremy_Gibbs]

Did you specify vr VR-Default?