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.