Once the tower is weekend <1 strength the Flag drops Will the flag raise If <0

After scoring enough boulders to weekended the tower [Tower Strength = <1] If an alliance receives a fowl adding one tower strength bake to the opponents tower [Tower Strength now = >0] will the flag raise back up signaling the tower can NOT be captured at the end?

I would assume so. However, your definition of Weakened needs work.

A Weakened tower has a Strength of <1 (or, if you prefer, <= 0).

I posted a Q&A question regarding this this morning, and it was just answered. Copy-pasting for reference (Q567)

“Per Section 3.1.4: “A TOWER is WEAKENED if the TOWER’S STRENGTH is at or below zero (0).” If you earn a TECH FOUL and the STRENGTH is increased from zero(0) to one (1), the TOWER is no longer WEAKENED. If the TOWER’S STRENGTH is -1 (negative 1) and a TECH FOUL is assigned, the STRENGTH is increased to zero (0). In this case, the TOWER would remain WEAKENED.”

coders syntax the IDE would have gigged me.

But Thank you for posting the question today and relaying it here.