I'm using STK 500 + Studio 4.16 build 628, configuration of STK per latest Atmel STK500 doc for serial HV programming.
I earlier used Studio 4.13/Serial Programming and had no difficulties programming Attiny13B chips..., for a while. Then the dreaded "Can not connect" message appeared. After fussing with everything imaginable, I tried a fresh chip. Voila! Everything Ok and working. Later when re-programing the (new) chip, the "cannot connect" appeared again. Reading that some had switched to 4.16 to address this problem, I decided to try that. No luck. Tried switching to HV Serial. No luck. I note that the signature always reads as 00 00 00 00., which seems to be the problem. I now have two chips that are no-workies, and a dwindling supply.
While writing this.., I decide to roll the dice and plug in one of my two remaining chips and see if the signature would read Ok..., nope..., still 00's. I do not believe the STK500 is faulty (geeze, I *hope* not). Any help would be appreciated. TIA