I can confirm that the method described in http://unix.stackexchange.com/questions/13413/force-telnet-ssh-to-use-crtl-h-for-backspace is good workaround (at least for me, confirmed with both A5820 and A5120 using Ubuntu 13.10).
That is (on Ubuntu):
1) apt-get install expect
2) vi /usr/bin/kbdfix
or whatever you wish to call your file.
3) Put this into the kbdfix file:
#!/usr/bin/expect
#Name this file as kbdfix and make it executable in your path
eval spawn -noecho $argv
interact {
\177 {send "\010"}
"\033\[3~" {send "\177"}
}
4) Save the file and set proper permissions on it (for example):
chmod 755 /usr/bin/kbdfix
5) Now connect to your comware device:
kbdfix ssh username@1.2.3.4
(where 1.2.3.4 is the ip of your comware-device).
And voila! Backspace works as expected :-)