can't use Serial1 after pinMode(16.HIGH)

Hardware Arduino Due
1

Hi,
I am using TX2 and RX2 in serial communication.
But after setting pin 16 to LOW , I can't reuse it in serial communication.
Here is my code for arduino due:

if (inputString1.equalsIgnoreCase("BREAK")) {

Serial2.end();

pinMode(16,OUTPUT);

digitalWrite(16,LOW);

delay(350);

Serial2.begin(baudeADP);

}
2

That was a snippet of code, so here's a snippet of an answer: because.

3

this is the complete code:

void setup() {
   Serial.begin(9600);
   Serial2.begin(4800);
 }
 
 void loop() {
   // read from port 0, send to port 2:  
   if (Serial.available()) {
     int inByte = Serial.read();
     
     if(inByte == 'B')
     {
      pinMode(16,OUTPUT); // using pin 16 as an output 
      digitalWrite(16,HIGH);
      delay(350);
      Serial2.begin(4800); // using pin 16 again on serial communication 
     }

     Serial2.write(inByte);
 
   }
   // read from port 2, send to port 0:
   if (Serial2.available()) {
     int inByte = Serial2.read();
     Serial.write(inByte);
   }
 }

RX2 (pin 17) is wired with TX2 (pin16).
This code allow the arduino to recieve bytes on port 0 and send it to port 2.
Recieving 'B', pin 16 is switched to pinmode and returning again to Serial mode.

Its works perfectly on mega board:
With Serial Monitor:
hi -> hi
B -> B
hi -> hi
But problems come with the Due board:
With Serial Monitor:
hi -> hi
B ->
hi ->