This is strange.
The fw version is 90828E (i.e. 28/08/2009). So, it should appear 90828E in the 'system information'.
Try one of the follow to check the version:
1) Press SETUP on the remote control
2) Go onto TV icon and select it, then select DISPLAY FORMAT, go onto "16:9" without selecting it
3) Press 1 3 9 7 1 3 9 buttons and then ENTER
or:
1) Press SETUP on the remote control
2) Go onto TV icon and select it, then select DISPLAY FORMAT, go onto "16:9" without selecting it
3) Press 4 5 6 2 5 8 0 buttons and then ENTER
or:
1) Press SETUP on the remote control;
2) Go onto the padlock icon without selecting it
3) Press 7 8 8 9 buttons and then ENTER