Hello!
So I collected enough 4 star ships for this event, however, it is saying that even though I have 5/5 ships needed, I need to "collect and enhance valid ships in order to proceed". When is this bug going to be fixed?
Unless you're way over level for the challenge, you won't be able to gear the pilots enough to make it with 4* ships. With L78 G9+ Pilots, I needed 5-6* ships for that tier. The next tier needed L82 G10+ pilots in 6-7* ships.
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By the way, you are unlikely to succeed with just 4* fighters unless the pilots are pretty buff and well geared.