In order for the new hot end to work properly, some configuration changes must be made to the firmware. Specifically, the E3D hot end uses a different type of thermistor. Without a firmware configured to use the correct type of thermistor, the temperature readings will be wrong.
The CR-10 uses Marlin Firmware. Creality does not publish their files for the stock version of the firmware. This is a violation of Marlin's open source license. Therefore, you must either configure a fresh copy of Marlin yourself, or find a copy that someone else has already configured for the CR-10.
For your convenience, MatterHackers has made precompiled firmware images for you. These are based on mainline Marlin 1.1.8. Choose the correct firmware for your specific model of CR-10.
If you wish you may compile the firmware yourself. See E3D's instructions on the configuration changes that need to be made and also our guide on compiling and uploading custom firmware.
Your contributions are licensed under the open source Creative Commons license.
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