There are probably hundreds of posts saying "can't usb flash", it's usually down to the stick - the smaller the better.
Try a search to get more details if needed.
Once flashed, you won't be able to restore your own settings, so you'll need so have a look at https://www.world-of-satellite.com/s...older-than-4-2
Couch flashing is much easier than usb flashing, but it's a bit more complicated because of the age of your current image.
I'll see if I can find a recent post which tells you what to do.
Here's one https://www.world-of-satellite.com/s...l=1#post491707
We need to get your 3.2 image working first!!
Can you FTP or telnet to the box?