Symbian^3 was a corpse wearing makeup. Nokia was already pivoting to Windows Phone (the infamous Elop "burning platform" memo was just months away). The N8’s software was abandoned before it even matured.
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You needed a Windows XP virtual machine. You needed a specific version of the USB driver (the one signed by a certificate that expired in 2012). You had to hold the volume down key, the camera key, and the power button simultaneously while plugging in the USB cable exactly as the Phoenix log said "Scanning for product." Nokia N8 Custom Firmware -