CKDIV8 does exactly what is says. If you select, for example, a 1MHz Internal clock, then if CKDIV8 is set you will get 1MHz / 8 = 128KHz.
So you could select a 128KHz clock that way.

Most programmers struggle at this frequency but you don’t say which one you are using. I would guess AVRISP-MKII but not sure. Set the ISP clock as low as it will go and try again. It is often better to try reprogramming fuse back to a faster speed before trying other programming operations.

CKDIV8 does exactly what is says. If you select, for example, a 1MHz Internal clock, then if CKDIV8 is set you will get 1MHz / 8 = 128KHz.
So you could select a 128KHz clock ythat way.

Most programmers struggle at this frequency but you don’t say which one you are using. I would guess AVRISP-MKII but not sure. Set the ISP clock as low as it will go and try again. It is often better to try reprogramming fuse back to a faster speed before trying other programming operations.

I am using ATtiny44a and I want to set 128 kHz low power internal oscillator. I went through the device programming window and set the fuse bits SUT_CKSEL to WDOSC_128KHZ_6CK_14CK_64MS. In other words, I have set the system clock to be at 128kHz, 6 cycles start up time from power-down and 14 cycles + 64 ms additional delay from reset. I have unprogrammed the CKDIV8 as well as id doesn’t make any sense. I set the ISP clock frequency to 32 kHz which is 1/4 of the system frequency but it fails to enter to programming mode. I then use little lower at 25 kHz and is able to read the device signature but still is unable to be programmed returning a message that reads 0xcc instead of 0x00.

Any help will be appreciated
Thank you

Look on Fuse and Lock bits tab. Change CLKSEL (Clock Selection) fuses from default 1MHz Internal RC to High Speed crystal (value CLKSEL= 1111). Then go to Device menu -> Program ->Program Fuses.

Your AVR microcontroller will now use the 16MHz system clock.

THX!

Thank You
Ernoe