Trusty old switch still supported with this July update, Release notes and download link.
How to get the Image to the switch? Go to Maintenance > Download > HTTP File Download and select the image file. Click Apply in the lower right corner and wait until the process finished.
Note: I had to shrink the image filename a bit as the switch didn’t like the length.
Then you can choose to reboot from that image next time
Don’t forget to click on Apply in the lower right corner.
The final step is to reboot the switch which activates the new firmware image.