Right now I did factory reset thru the app on my iPad and connected both the iPad and Quest on my cellphone network just to avoid the wi-fi. Seems that after the factory reset and re-pairing the Quest the iPad app now shows that the update is in prog...

Same here, I also created a ticket. Just got a brand new Quest and experiencing same issues. Update in progress but nothing happens. Phone app says it's 213561.4150.0 version, same as yours.This is a replacement unit and the previous one worked like ...