You can reset a Mitel 6900 series phone to factory defaults in 5 simple steps. This applies to all premise and cloud versions of Mitel Connect and Mitel Connect Cloud. These instructions are for the Mitel 6920, the Mitel 6930, and the Mitel 6940 phones. These will be required if you are migrating to RingCentral
See How It Is Done Below
"See the 5 Steps to resetting your Mitel 6900 series phone"