On this link you find necessary info on resetten a IP phone
https://www.ucguru.com/reset-cisco-phone-factory-defaults/
But sometimes you brick a phone. I had some troubles with phone having firmware pre 8.5.2. After hard resetting a few phones I was left a few blank bricks.
The cure ? A Callmanager Express with firmware 8.5.2.
1. Enable CME (telephony-service etc.)
2. Add firmware to flash and config
3. Enable autoregistration or add ephones with the MAC addresses of the phones
4. Enable DHCP
5. Connect phones
As soon as the phones get a config XML from the CME, life will flow back into the phones. Firmware will be loaded and screens will pop on.
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