Programming via FTDI and Arduino IDE

hi @all.

i have problems programming atmega328 on breadboard using arduino ide.
since controller uses internal oscilator, burne atmegaboot_168_atmega328_pro_8mhz.hex bootloader avr dragon , atmel studio. furthermore have programmend fuses defined in boards.txt included int https://www.arduino.cc/en/uploads/tutorial/breadboard-1-6-x.zip
i have added whole section of file board.txt located in arduino installation path.

choosing "atmega328 on breadboard (8 mhz internal clock)" in arduino ide , appropiate com-port of ftdi cable able program scetch controller, first time after burning bootloader. @ point no further programming of scetches unpossible.

reading fuses again atmelstudio, extended fuse has changed 0x05 0xfd. changing fuse again not solve problem.

i have programm bootloader again able program scatches....


can me issue ?

0x05 = 00000101
0xfd = 11111101

only lower 3 bits of extended fuse byte used, upper 5 read 1.

do have 10k pullup resistor, 0.1uf cap between ftdi's dtr pin , reset, , 0.1uf caps on vcc , avcc pins gnd?

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