Thanks for the quick response.

Thats what I am using. Settings in Arduino IDE are:

board: Sensebender Micro
processor: Atmega328 8Mhz

Edit: I tried another FTDI, same result Both are 3.3v btw

Edit2: I was able to flash the sensebender with an ISP. Flashing via FTDI still not working.

Hi simbo,

I run into similar problems. I was not able to flash one of my sensebenders once. I use an FTDI with 3,3v power supply.
I do get the serial debug output from the sensebender when running, but I am not able to flash any new sketch.

In the board configuration I use the sensebender 8Mhz. I ordered from itead.

What board do you use in platform.io to flash?

I do not have an ISP. Do I need it to flash the sketch?

Thanks.