Make sure the phone has not been reported as LOST/STOLEN.
Installing a custom ROM can potentially brick your device or cause data loss. Proceed with caution and at your own risk.
IMEI is a unique number assigned to your phone.
This identifier is used while reporting the phone as lost or stolen in order to block the device.
Do not forget to pass a captcha test.
And then just click the button in order to check IMEI in the international database.
Now you can be sure whether the ESN is bad or clean.
Note that blacklisted phones can not be used with most mobile operators.
Installing a custom ROM can potentially brick your device or cause data loss. Proceed with caution and at your own risk.