When I did the curl step, it ends with this:

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  3430  100  3430    0     0   4898      0 --:--:-- --:--:-- --:--:--  8108

The important number is the 3430 as this is the number of bytes that should have been transferred. It looks like your NeTV only transferred 97 bytes. Here's what you posted in the forum:

curl -o update.sh http://netv.bunnie-bar.com/updates/chumby-silvermoon-netv/update.sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    97  100    97    0     0   2333      0 --:--:-- --:--:-- --:--:--  2939

Type this:   ls -l /tmp/update.sh

You should get something that looks like this:

-rw-r--r--    1 root     root          3430 Feb 11 20:09 update.sh

What number do you see before the date? I think it should be 3430.