Update kernel on Raspberry Pi3

I am attempting to update my 16.04 MATE on a Rapberry Pi3 to the same kernel (4.4.11)as the latest Raspbian.

I entered:-

sudo rpi-update faf071dd4885c5ac1a89483d35a5326e7f69495f

This seems to have failed

 *** Backing up modules 4.1.19-v7+
 *** Downloading specific firmware revision (this will take a few minutes)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   168    0   168    0     0     73      0 --:--:--  0:00:02 --:--:--    73
100     9  100     9    0     0      2      0  0:00:04  0:00:04 --:--:--     4

gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now

Can anyone help?