Is it possible to send characters through serial to go up a line on the console window?
Use VT100 escape codes to control the cursor.

Eg.

puts("\033[2J");   // clear screen
puts("\033[0;0H"); // set cursor to 0,0
puts("\033[10B");  // move cursor down 10 lines
puts("\033[5A");  // move cursor up 5 lines