> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/hardware/oem-readers-and-components/oem-readers/odynamo/documentation/user-manuals/emv-tag-and-capk-update-instructions/overview.md).

# Overview

This document is intended to be used with the MagTek Reader Management System Windows Application.

#### RMS Windows <a href="#rms_windows" id="rms_windows"></a>

* Windows Application (PN 1000009734)
* For use with DynaPro Go and oDynamo devices.

### Purpose <a href="#id-1.1_purpose" id="id-1.1_purpose"></a>

This document provides instructions for updating the Certificate Authority Public Keys (CAPKs) securely stored in DynaPro Go and oDynamo devices. CAPKs are used in EMV (Europay, Mastercard, and Visa) payment systems to verify the authenticity of card transactions. Each CAPK is associated with a specific issuing bank or payment network and has an expiration date, after which it must be updated in the device.


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