How to flash your E011 to acro firmware and instal an FPV camera.
Eachine E011 https://goo.gl/fxPwA8
St-link V2 https://goo.gl/4m84b7
Keil uVision https://goo.gl/ykvoHf
ST-Link utility https://goo.gl/BGDDQe
NotFastEnuf acro only firmware https://goo.gl/KRfrqe
Silverxxx dual mode firmware https://goo.gl/19Vywz
I personally prefer NotFastEnuf acro only firmware.
I have other videos on how to get the flysky i6 to work with your e011.