In Islam, when someone converts (reverts) to Islam, they start with a clean slate, meaning all their past sins are forgiven, and they are not held accountable for any religious duties, including missed prayers, prior to their conversion. Therefore, they are not required to make up for missed prayers from before their conversion.

Once a person becomes a Muslim, they are responsible for performing the five daily prayers from that point forward. If they miss any prayers after converting, they should make an effort to make them up as soon as possible. However, they are not obligated to make up for prayers that were missed before they accepted Islam.