MSP430 problem entering bootstrap mode

[thierrydollar]

Hi,

I'm encoutering a very tricky situation regarding the bootstrap loader
mode.
I can or cannot reprogram my MSP430 depending of its memory content.

For example, I can always program it if the memory is empty. But
it the MSP430's memory already contains a program containing
WDTCTL = WDTPW + 0x80;
WDTCTL = WDTPW + 0xB8;
Then I get a timeout error when I try to reprogram the device.

Any idea where this might come from and how to solve it
Thanks for your help
Thierry Schneider