If the BEC on the FeatherTwo was connected to the RX, it will have powered the RX backward and blown it. If the TZs were connected as well, it may have fed back down into them and made them unhappy too. But first try a new RX and check to see if they are actually dead.
You should always cut all but one BEC supply from the ESCs. They don't play well together even if they are all wired the right way round.
The feather two will be beyond economic repair if it's been plugged in backwards




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