I have the same issue in PS4 and manage to load again my save file.
First I create a new character and then after I got to the game I load the other one and it works.
Hope it works out for you guys too.
ultimately what worked for me was getting a tech to call me and he had me safe mode my console (holding the power button for a beep) and then doing option 5 i think it was. Something about checking the database. ps4 did that I reinstalled the game (with internet turned off for the console) and then after it was done turning on the internet for it and letting it download the patch again. Its been working fine for me since then.
I have tried all of these solutions and none of them have worked for me. This is extremely frustrating and I have over 70 hours logged into this game. First it was the game-breaking Winter Palace glitch, and now this. WAKE THE **bleep** UP AND FIX YOUR **bleep** GAME, EA/BIOWARE!
EDIT: I have now solved one problem. What worked for me is turning off my PS4, unplugging the PS4 and leaving it unplugged for 3 minutes, then plugging it back and started the game. No longer receiving the "installation unfinished" message and I can now play multiplayer and load my saved games. Still stuck at Winter Palace, however.
