New day, new app in Cydia: EmailECID. EmailECID is a new utility app that will let you save your ECID ( 16 digits ) and send it to you via email, all without putting your iDevice in recovery mode. Once you get the 16 digits you can use Firmware Umbrella and download your certificate.
Remember that, the ECID certificate is an essential file for downgrading the firmware, and you will be able to restore without loosing the ability to jailbreak.
FSM EXCLUSIVE DEAL You can find EmailEcid in Cydia via modmyi repo and it is created by the same guys that created RockApp.