Upgrading firwmare on S4100 series Dell switches with OS 10

To perform OS10 upgrade using CLI use below steps:

For download the appropriate image for the switch using Dell Digit locker ( https://www.dell.com/SUPPORT/SOFTWARE/ )
Download OS10 Enterprise Edition image, from the site in tar file format for the upgrade.

Take configuration backup of current running config from exec mode

copy running-configuration startup-configuration
copy config://startup.xml config://<backup file name>

Check the ONIE kernel version version in use:
```
system "file /mnt/onie-boot/onie/vmlinuz*"
```
Only if ONIE kernel version is 4.x.x proceed further with OS 10 upgrade using further steps
Extract the downloaded tar file in above steps to get binary image
Download the image (Only downloads, does not installs) to OS 10 switch using:
```
image download file-url
```
For example scp from a remote Linux machine
image download scp://userid:passwd@hostip:/filepath
Check image status
```
show image status
```
Only if running OS10 release 10.5.0.x or earlier and installing 10.5.2.0 or later now
```
image cancel
```
Install the 10.5.2.6 or later software image in EXEC mode.
```
image install image-url
```
For example:
image install image://filename.bin
See image status and boot detail
```
show image status
show boot detail
```
Reload switch based on previous and new OS versions
1. If System is presently running an OS10 release earlier than 10.5.1.0 and you are installing 10.5.1.9 or later
```
reload
```
2. System is presently running OS10 release 10.5.1.0 or later and you are installing 10.5.2.6 or later now
```
boot system standby
show boot detail
reload
```
After reboot check version
```
show version
```
(Optionally) If you do not want to failback to older version and want both active and standby OS to be of the upgraded version then use:
```
show boot detail
image copy active-to-standby
show boot detail
```

Refer:

Anonymous