Pick your specific CPU from the dropdown (e.g., SC9863A ). Some tools have an "Auto Detect" button.
Before attempting a repair, it is vital to understand why the IMEI was lost in the first place. The International Mobile Equipment Identity (IMEI) is a unique number assigned to every mobile device. It is stored in a specific partition on the phone’s internal memory, often referred to as the NVRAM or EFS partition. unisoc imei repair tool