Now, I could easily be missing a detail here, but my understanding is that the following steps occurred (obvious spoilers):
- Peter gets EDITH and "registers" himself using the glasses.
- Peter 'befriends' Beck and determines he's better suited to use EDITH. Peter transfers full control of EDITH to Beck.
- Betrayal and shenanigans from Beck/Mysterio ensues, ending with Beck's death.
- Peter takes back control of EDITH somehow (and without any indication of a transfer of control?) and orders them to abort.
How was #4 possible given the fact that Peter gave up control? I wouldn't have assumed they could both have control, since Peter never attempts to give EDITH commands during the time Beck is using it, unless Peter (in)conveniently forgot/didn't know up until the very end. The best guess I have is that control fell back to Peter after Beck's death somehow, but I have no proof.
I've seen a couple of posts on other sites, but they all seem like conjecture and speculation. Nothing official.