After flashing firmware usb needs to be unplugged and plugged back in to open serial port. · Issue #7191 · betaflight/betaflight · GitHub
![Fix any STM32 DFU Drivers issues when flashing Betaflight/Cleanflight firmware - Guides - DroneTrest Fix any STM32 DFU Drivers issues when flashing Betaflight/Cleanflight firmware - Guides - DroneTrest](https://www.dronetrest.com/uploads/db5290/original/2X/4/46dea181c09a751e542ef981d97c41469cb03383.jpg)
Fix any STM32 DFU Drivers issues when flashing Betaflight/Cleanflight firmware - Guides - DroneTrest
REVO. USB DFU flashing hangs with "Full Chip Erase" enabled. · Issue #200 · betaflight/betaflight-configurator · GitHub
![Configurator doesn't properly error when flashing firmware that is too big. · Issue #1682 · betaflight/betaflight-configurator · GitHub Configurator doesn't properly error when flashing firmware that is too big. · Issue #1682 · betaflight/betaflight-configurator · GitHub](https://user-images.githubusercontent.com/190571/65384151-96ef8300-dcd3-11e9-88ea-1b0b3a0cb1f9.png)