Buhari change new note during military regime

I think there may be some misinformation here.

Muhammadu Buhari was a military head of state in Nigeria from 1983 to 1985, during which time he introduced a new currency, the Naira, in 1984. However, he did not change the design of the Nigerian currency notes during his military regime.

The Naira was introduced in 1973, and during Buhari's regime, the Central Bank of Nigeria (CBN) continued to issue new notes and coins to replace the old ones. The design of the notes remained largely unchanged, with the exception of some minor updates to the security features.

It's possible that you may be confusing Buhari's regime with another period in Nigerian history or another country's currency. If you could provide more context or clarify what you mean by "change new note", I'd be happy to help clarify things for you!