If you are using PuTTY or any variant version such as Kitty (not the feline, but the SSH client!), you may have noticed that backspace does not work with some devices. To resolve this matter, follow the easy steps below.
1. In the client window, on the left pane, browse to :
Terminal > Keyboard
2. Under “Change the sequences sent by: The Backspace key” :
Then select the “Control-H” option instead of the default “Control-?”.
3. [Optional] Make sure to save your change for a permanent effect.