I tried following the instruction on how to restore my iPhone without passcode using reocvery mode but "Unknown error occured (0xE8000084)" prompts and discontinue the process. Please help. Thank you.

May i seek assistance please on how to unlock my iPhone as the passcode is no longer accepted. I tried following the procedure using recovery mode as i was not yet able to sync it with icloud or iTunes but when the message "iTunes could not connect to the iPhone because it is locked with a passcode......." appears then i clicked Try Again and press power button and home button at the same time while cable is connected to the unit and computer. An error prompts "Unknown error occured (0xE8000084)" then stops the process and phone was not restored and went back to the same problem that i cannot open it. Hope someone can assist me on this please. Thank you very much in advance.