1. You need to be in an open lobby
2. Open XMB and then switch to another user on ur PS4
3. Sing off PSN
4. Sign back in and switch directly back to ur first user
5. Go back to GTA
6. Kill urself
7. Start Creator Mode - Create Deathmatch - Deatchmatch
8. hf
Sometimes ur player is invisible to the others, sometimes not. U can do this with friends. U stay in the same lobby. Make sure u set time up to 60 minutes before testing.
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reason for edit: found a video in english