flash programming and extended flash

Hello,

im using msp430f5328  and writing a code snippet to update a firmware  by write .hex to flash,  i divided the FLASH and FLASH2 into two partitions for firmware1 and firware2 each , as i read that reset vector and initialization tables MUST exist in FLASH not in MSPx extended flash

FLASH_FIRM1             : origin = 0x4400, length = 0x1388
FLASH_FIRM2             : origin = 0x5B88, length = 0x1388
FLASH2_FIRM1            : origin = 0x10000,length = 0x88B8
FLASH2_FIRM2            : origin = 0x18CB8,length = 0x88B8

    .text       : {}>> FLASH2_FIRM2     		/* CODE                              */
    .text:_isr  : {} > FLASH_FIRM2              /* ISR CODE SPACE                    */
    .cinit      : {} > FLASH_FIRM2			/* INITIALIZATION TABLES             */
    .const      : {} > FLASH_FIRM2				/* CONSTANT DATA                     */
    .cio        : {} > RAM                /* C I/O BUFFER                      */

    .pinit      : {} > FLASH_FIRM2              /* C++ CONSTRUCTOR TABLES            */
    .init_array : {} > FLASH_FIRM2              /* C++ CONSTRUCTOR TABLES            */
    .mspabi.exidx : {} > FLASH_FIRM2            /* C++ CONSTRUCTOR TABLES            */
    .mspabi.extab : {} > FLASH_FIRM2            /* C++ CONSTRUCTOR TABLES            */

i used msp Intrinsic __data20_write_char  to write in extended flash area, after finish writing the first chunk of bytes, and when it goes to received next chunk from SPI the MSP430 just hangs and when i stop the debugger it gives "No source available for "0xXXXX" " with  random addresses each time.

is there any clue what i did wrong and if there a better way to implement this?!!

Thanks in Advance,

Sima