I downloaded the update yesterday and then found that I had lost all of my multiplayer weapons and progress. Has anyone else experienced this, and is a second update giving me my progress out yet?
Losing all MP progress seems to be at the extreme end of a bad problem. I hate to be the bearer of bad news, but if it has truly corrupted and been wiped, you can’t and won’t get that experience back with a future update.
I’ve heard/read of people losing 10min-1 hour of experience, but not everything.
The following tips I’m about to mention are probably redundant, but I’m going to be thorough regardless.
*Were you Stat Padding/ Boosting? Battlefield games (Post BF2) have taken the matter VERY seriously and numerous safe-guards have been set in place. If they catch you, they will wipe your stats.
*Make sure you are signed in with your proper Origin ID/ Console Account. This isn’t usually an issue on PC, but playing BF on the consoles can get tricky sometimes.
- On the consoles, your Gamertag/PSN ID can be switched to another Origin ID. Contact EA Customer Support (A bitch, I know) and have them reassign it. (This is very uncommon, but it happened a lot of Bad Company 2)
Make sure you have the proper storage device select on your platform.
-If on your PC it would behoove you to locate, and reguarly back up your Profile data to a safe location in case your saves get corrupted. Online data is kept on EA Servers, but having the information to verify with the server may (No information to substantiate this) help their servers “find” your information.
-Always save/back up Xbox Game files to the cloud. BF3 and now BF4 have been notorious for corrupting save data.
I really feel bad for you and your situation. Clearly, this game was launched prematurely to capitalize on the Pre-console generation crowd as well as proceeding Call of Duty sales. As a result, rampant crashing and to a far lesser degree instances like yours.
Your best bet would be to contact customer support and see what they can do. At the very least, they’ll report it to the developers.
I’ve had a similar issue, except my problem was that I made a bunch of progress, I’d unlocked a ton of guns, but my game froze. When I restarted my console, and most of my progress had been restarted, however I had different starter weapons the second time. For example, The first time, I started with the RPG as my rocket launcher with Engineer; when I lost my progress, I had the LAW instead. I’m really confused about it.
I looked at it again, and I guess I was wrong about exactly what was lost. I still had all the unlocks for the class kits, but not guns. I still had progress to unlocking carbines, but no other weapons. I also had the LAW somehow. All told, I’m most of the way back to unlocking it again. It’s just weird that it happened to me. My roommate had the same issue, so I was wondering if it had something to do with the multiplayer update.
I also agree that it was launched prematurely.
This sounds like a much more common problem. First offL The LAW is a starting launcher for the engineer class. You should have that. 
Next up, losing progress like that is a result of a round not saving the stats (Usually caused by a freeze during a loading screen).
That makes sense. But why would I have the RPG one day, then the LAW? That was the confusing part.