Just seen this over at XDA and i can confirm it works
1. Clear Data from Google Services Framework Data
(Some Google Applications might crash)
2. Go to Software updates (note that time has reset to 1969)
3. Click Check for updates
*** It will show 4.0.4 and click download and Voila!
source - [ICS] [UPDATE] [OTA] IMM76 from IML77 (4.0.3 -> 4.0.4) - Page 8 - xda-developers
1. Clear Data from Google Services Framework Data
(Some Google Applications might crash)
2. Go to Software updates (note that time has reset to 1969)
3. Click Check for updates
*** It will show 4.0.4 and click download and Voila!
source - [ICS] [UPDATE] [OTA] IMM76 from IML77 (4.0.3 -> 4.0.4) - Page 8 - xda-developers