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Recently, Z.-W. Sun made the following conjecture: for any odd prime $p$ andodd integer $m$, $$ \frac{1}{m^2{m-1\choose(m-1)/2}}\Bigg(\sum_{k=0}^{(pm-1)/2}\frac{{2k\choose k}}{8^k}-\left(\frac{2}{p}\right)\sum_{k=0}^{(m-1)/2}\frac{{2k\choose k}}{8^k}\Bigg)\equiv 0\pmod{p^2}. $$ In this note, applying the "creative microscoping"method, introduced by the author and Zudilin, we confirm the above conjectureof Sun.

Proof of a supercongruence conjectured by Sun through a $q$-microscope