It sounds like you're referring to a post or tool related to bypassing Factory Reset Protection (FRP) on Android devices, specifically mentioning:
The first step was the most delicate: entering the ECID register. register ecid frpfile portable
Remember, this process only works for "Checkm8" devices (A7 to A11 chips). Supported: iPhone 5s, 6, 6s, 7, 8, and X. It sounds like you're referring to a post
Before you download any software or connect a USB cable, you must understand the anatomy of this process. register ecid frpfile portable