In this post you can find how to rewrite or repair your IMEI number on your android device (phone or tablet). In some cases when your android device got bricked, after repairing it you might face issues with SIM network because of invalid IMEI on your android. There are many reasons behind it. In order to fix this issue you can read the below guide to repair imei on android.
NOTE: This guide is only to repair your android phone using your already existed imei number which you got along with phone, but not to change it. Changing imei is illegal and we don’t support that.