According to the novelization of Rogue One, the destruction of the shield gate on Scarif was only temporary.
The TIE fighters would concentrate on his flagship once the Empire recognized his intent. But in truth, he didn’t need to hold out long. The shield gate would regenerate swiftly enough; Rogue One’s window of opportunity to transmit would be narrow, and if it closed there would be no other.
Rogue One: A Star Wars Story
However, in the film, it appears to have been quite thoroughly destroyed:
How would the gate have recovered from this massive damage and “regenerated”?