Restart your PC with "Disable Driver Signature Enforcement" (Shift + Restart -> Troubleshoot -> Advanced -> Startup Settings).
Phoenix will prompt you to disconnect the phone, remove the battery, reinsert it, and press the power button briefly. Follow the on-screen instructions precisely. nokia e6 custom firmware install
This process carries risk. While the E6 is hard to hard-brick, it is possible. Back up your data. Restart your PC with "Disable Driver Signature Enforcement"
Before you download a single .exe file, you must understand the landscape. remove the battery
Always.