How to recover the IMEI of a phone


    Hi I have a unlocked galaxy s3 that I got bored with it and well I decided to make my play device for my first custom ROM and as expected it went horribly I constantly got error messages and at one time that the installation was successful well the phone got stuck in a bootloop and finally after a lot of retrying I deleted or corrupted the IMEI now the phone wouldn't connect to ethier the internet or a network  and well in order to fix that I need root and since root each time that I do flashing it kinda disappears. Now the phone wouldn't get any root permissions for some reason I tried kingroot and other apps and nothing work

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