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The first answer you referenced is from an outdated FAQ. Please disregard.
You need a new upgrade to replace a scrapped upgrade. Your robots like their weapons and don’t cotton to giving them up willingly.
In this scenario, Demolisher’s ability would draw 1 card and you would be able to use Megatron’s flip ability.
On Static Laser of Ironhide, “NOT Ironhide” should also be taken as “NOT named Ironhide”.
Blurr must attack an untapped character and thus is unable to attack a tapped character with brave. If your opponent also had an untapped character with brave, Blurr would have to attack that character.
Armed Hovercraft does the damage, not the character that has it equipped.
These would all trigger at the same, so you would choose the order they happen in.
If you scrap an action, Optimus Prime won’t be able to find it, as it has left the played area.
Multiple Security Consoles should be resolved one at a time. Their effects do not combine. If you put a card on the top of your deck from the first one, be sure to act surprised when you draw it again.
Optimus Maximus would take the damage from Static Laser of Ironhide, as he is not named Ironhide. You can keep Ion Blaster of Optimus Prime if you already had one upgraded to Optimus Prime - Gleaming Commander, but you could not put one onto Optimus Maximus.