Does Umrah become void if Tawaf was mistakenly started on the second floor after one circuit and then completed?

Since you performed some of the first circuit of the Farewell Tawaf without the intention of performing tawaf at the beginning, and you did not perform another circuit in its place, your tawaf is incomplete. This is because the Farewell Tawaf requires a specific intention, as it is not part of the general rituals. The tawaf is not valid without seven circuits according to the majority of scholars, and whoever does not complete it is considered as if they abandoned it, basing their argument on the hadith: "Indeed, actions are by intentions."