What do i do on ps4!!!
So I sat at the menu for 30 minutes as I mentioned in one of my previous posts and recieved the HF-501 error after it downloaded 120mb. I gave up but the next day I went to my brothers house to borrow his hotspot. I brought it to my house and it gets about 1mbyte/s meaning the update should take at least 2 minutes to download, but instead it put me right in the match after saying applying update. I’m doubting it was the increased bandwidth that resolved the problem.
Waiting at the menu until HF-501 appears may be the solution… could somebody test this?
The problem is probably with moblie hotspot connections,ive spent more than enough figuring nat type to fix playing games,im not gonna spend more time fixing what you did wrong ive had enough ,id rather delete overwatch ,its just too hard to fix everything when u paid for the right one
Is his hotspot on a different company’s network? Or how is the plan he’s using different, other than speed? It does seem that one network/data plan was blocking large file downloads and the other wasn’t, judging by this info.
Any updates guys? 
2 weeks with this problem, but I also noticed that I can’t send tickets on blizzard page (it stays loading eternally). So my conclusion: My errors HF-2, HF-5, HF-501 are caused by my slow connection, maybe i am being kicked by the server or the server thinks I am doing a DDoS.
Try to use a vpn and wait in the lobby for a bit i think i also had the same problem with slow internet
If the suggestions from the post above does not resolve the issue on Windows, then the problem is likely a connection related issue.
We’ve confirmed this message is corruption or a connection related issue to the CDN service. Please try a VPN or alternative connection to work around the issue.
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Thanks for update its fixed now
Okay. here is what fixed mine. I tried all the other methods, including reinstalling.
I noticed that this began while queued for comp and clicking on a custom game to join in the meantime. While it was loading, the comp queue found a game and added me to it. But it was already in the applying update phase of the custom game. So I got stuck with this whether I tried training, quick play, or comp. After going through all of the trouble shooting steps I had an idea. I went Play > Game Browser> Create Game. When creating my own custom game it finished applying the update. After that, I could play any game without getting the applying update error/
soo the way i fix it is buy delting the overwacth file for the data file then restart my PC then use a vpn to let the update apply then it u close the game and the vpn and it should work fine