: Once in Fastboot mode, use: fastboot flashing unlock (or fastboot oem unlock for older devices) .
: Navigate to Settings > System > Developer Options . Turn on USB Debugging and OEM Unlocking . how to unlock bootloader without sim card
: Some users report success by removing the SIM and attempting the account binding process over a stable WiFi connection, though this is often restricted by newer MIUI/HyperOS versions . : Once in Fastboot mode, use: fastboot flashing
Go to > Software Update and tap Download and Install (you don't need to finish the update; this just triggers a "phone home" to Samsung). : Once in Fastboot mode
If the option is greyed out, ensure you are connected to the internet and wait a few minutes for the system to update its status.