I regularly work with Dell PowerSwitch S41xxF-ON and S52xxF-ON series switches for both networking and iSCSI. If you have read some of my blog posts you’ll see I like to keep things updated. Here is the process I normally use.
Download the firmware update from the Dell Digital Locker
If needed extract .tar download so you have the the .bin file.
Place the .bin file on a SFTP server like Solarwinds Free Server https://www.solarwinds.com/free-tools/free-sftp-server
SSH into your Switch and run the following commands. Please note the image install takes 10 or 15 minutes to complete. Just keep running show image status to check the status.
copy running-configuration startup-configuration
copy config://startup.xml config://backup.xml
image download sftp://COMPUTERNAMEORIP/IMAGENAME.bin
image install image://IMAGENAME.bin
show image status
show boot detail
boot system standby
After the switch reboots SSH back in and check the version.
If needed you can cancel the image download or install.