Feiteng N9300 SC6820 FDL2 Failed
sorry for my bad english
This phone is very ... tricky! Hard root, hard firmware finding. It may happen that you click on Erase All on ResearchDownload. And now is phone completely dead! No reaction to load firmware.
How fix this? You must change "flash procedure" - remove battery, connect cable, choose firmware in Research download and click to Start downloading. Now push volume down button on phone and insert battery! Phone is now working!
But new error - Failed: Operation failed after flash FDL2 file
You must uncheck all items in tab "Calibration". And flash now! Phone is back in live!