Thanks, steve

But it's already done ... ( also default setting, i think )

Even microchip tell me to erase device before re-programming...so, it's a real bug !!!

As their SSR 19753 says clearly EEPROM ERase doesn't work with 16F628, 16F84 and 16F876 ... what to do ?

Really Funny ... isn't it !!!

Regards
Alain