Little problem here : the board is not booting anymore.
What i did :
i booted my board normally, logged in and let it in idle mode.
2 hours after, i unplugged it (jack power supply and USB cable), flashed my sdcard, re-insert the sd card into the board.
First, when i plugged the USB cable, the green led didn’t switch on. It only did when i plugged the jack power supply.
Then when opening the serial link, nothing happened.
I checked the SD card on another espressobin, it worked.
When plugging and unplugging the USB the FTDI is detected.