After uploding newest heltec board support (3.0) and library (2.0.2) software uploads fail mid upload leaving the heltec device in a non operational state. I can put the device in firmware download mode, but it never responds to an upload request. Arduino reports uploading error. I have tried Heltec Wireless Stick Lite V3 and Heltec Wireless Stick V3. Both are having the same problems.
