No, Florida Virtual School (FLVS) courses generally cannot be used to *replace* a failing grade in a traditional brick-and-mortar school. While FLVS courses can be used for credit recovery or to make up for missed coursework, the process and acceptance of those credits to replace a failing grade within a student's current school is determined entirely by the student's *home school district and individual school's policies*.
Some districts might allow FLVS courses to count towards credit recovery, but this is not guaranteed. It's crucial to contact the student's school counselor or administrator directly to inquire about their specific policies regarding credit recovery using FLVS or other online learning platforms. They will be able to explain the process and determine if it's an option in this particular situation.