Servers can be slow. Give it 10–15 minutes before trying the bypass again. Tool Stuck on "Checking ECID"
Modern portable tools do this automatically: clicking "Start" will read the ECID, register it, and flash it in one click. register ecid frpfile portable
Are you working with a specific or iOS version , or did you need help with the Jailbreak step first? Servers can be slow
To prevent replay attacks, the iOS device generates a random cryptographic number known as a "nonce" during the boot process. The signing server must sign the firmware with not only the ECID but also the current nonce. This ensures that the authorization is valid only for that specific boot session. Are you working with a specific or iOS
Ensure you have the latest iTunes or Apple Mobile Device Support drivers installed.