We just bought AVRUSB programmer to flash the radio firmware in our new product we connect the unit to the PC and to the unit using the JTAG adapter, we flashed the firmware and every things seems to be OK. I did device > Flash > verify and I got a lot of red bits in the application UI (AVRUSB Ver. 18.104.22.168) and it reports verification failed.
I changed the Programmer ISP speed from highest to lowest and 2 other value between. I always get the same results, the only different was the flashing time.
Programmer speed should not be an issue, especially on JTAG, unless you have a very slow target clock or very low voltage. If changing ISP speed in Setup doesn’t work then it is likely to be one of the reasons given below.
Three possible causes are
1) Device is not Erased before programming
2) USB latency is too low. Click Setup button at top right of screen and check USB latency is set to at least 16.
3) Check EEPROM and flash timings are ok on setup screen. Click Default button in Setup screen.
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