This patch allows for the A2M8 (Not A Job for Tyrone) early phone call glitch. The newer patches seem to have fixed it.

Simply find where your current patch.dat ,patch.fat, and dll files are located and replace them with these files. If you have the game on Steam, the patch files are located in Program Files (x86)\Steam\steamapps\common\Watch_Dogs\data_win64 and " "\bin. You should see the text change to 1.04.497 and Bad Blood disappear from the main menu (if you have it installed) if this downgrade works.