Did the manga reveal how Hagoromo gained the Rinnegan?

[Ansatsuken]

????

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OT. No, it just said he awakened it.

When someone bring Obito's statement about Rinnegan make sure you counter it with Nagato. Priceless to see their reaction

 

[KCMNaruto]

Of course no, however I always assumed that Kishi wanted to portay the way Hagoromo awoken his rinnegan through Nagato awakening his rinnegan through normal eyes, I mean before he decided to retconn it and connect rinnegan to sharingan in some way.