Nokia E7 hard reset
Press menu button > Settings > Phone > Phone management > Factory settings > Delete data and restore > YES
You can format your device by typing *#7370# in standby mode. Before the device is reset, you need to provide the lock code. The default lock code is 12345.
Formatting the device will permanently erase all user data and settings as well as add-on applications and operator specific settings.
The Nokia E7 contents of the SIM card and memory card (MMC) are not erased during formatting.