Whether on not a stock can come back from the grey market is a moot point for $OVIT. There has to be someone trying to bring it back. In this case (as well as for COHG, CHME, and ZHUD, and others I'm not invested in) OMNI has thrown in the towel and asked the court to rescind the Custodian request.
This (and the others) is most likely a dead ticker, never to be heard from again.
Please don't think I'm bashing the stock to buy more, this one going down on its own. Between the 4 tickers, I've lost close to $35k. That's why I spread my money around and never YOLO a ticker.
Don't trust me, I don't know any more than you do!