How to reboot Fastrack sumpreme

I added some ANSI C code lines into Hello_world sample as below

void adl_main ( adl_InitType_e InitType )
TRACE (( 1, “Embedded : Appli Init” ));

/* Set 1s cyclic timer */
adl_tmrSubscribe ( TRUE, 10, ADL_TMR_TYPE_100MS, HelloWorld_TimerHandler );
FILE *f_write; 
FILE *f_read;
char buff[20];
f_write= fopen("test.nmea","a");
fputs("NMEA freams",f_write);

f_read= fopen("test.nmea","r");


and then the building was OK, I download this program into Fastrack, and then immediately I can not type key on the Hyperterminal,
could you please help me.