Incorrect activation ticket injection can corrupt the device’s NVRAM or SEP (Secure Enclave Processor), leading to a permanent brick – an expensive paperweight.
If you cannot remember the Apple ID at all: Doulci Activator Mac Download Free
If you bought the device second-hand, this is the only 100% safe and free method. Ask the previous owner to remove the device from their iCloud account. They can do this remotely by logging into iCloud.com/find, selecting the device, and clicking "Remove from Account." selecting the device