Type: su (if rooted) or proceed to trigger the diag port via specific boot codes. 2. Use a Service Tool
Changing an IMEI to a different number (spoofing/cloning) is illegal in most countries and can result in heavy fines or imprisonment. This guide is for repair only , not alteration.
Without a backup, full IMEI recovery may be impossible on Exynos chips without paid hardware.
This process voids your official manufacturer warranty. If you're interested in pursuing this, I can help you find: The exact driver links for your Windows version.
If all else fails, visit a repair shop with an , Sigma Key , or Z3X Box . These are professional hardware dongles that can forcefully write the IMEI to the EFS partition even if the phone is hard-bricked.