What is PRD?
PRD is a code stored in and printed on any Blackberry phone, in length of 13 characters and starting with string(letters) PRD. Generally PRD stands for Product Requirements Document defines product a company make, features and requirements.. A Blackberry PRD is look something like PRD-12345-123.
From PRD you may find model, designated network provider, country, software version, included languages, and more technical details.
How to find PRD?
PRD should be printed on the UPC label commonly located inside battery compartment, under the battery . Also from Blackberry Engineering Screen which can be accessible through phone’s firmware.


how can I upgrade my BB 8520 phone.