QuickServer Firmware Format Changes: .PKG vs .SIMG

Overview

Starting in 2025, QuickServer firmware updates transitioned from the legacy .simg format to an encrypted, digitally signed .pkg format. This article explains the change, its impact on existing devices, and how to confirm the correct format for your device.

What Changed

QuickServer firmware now uses signed .pkg files to ensure firmware authenticity and prevent unauthorized modification. This aligns QuickServer with modern firmware lifecycle practices used across industrial and building automation systems.

Legacy Devices (Pre-2025 QuickServers)

QuickServers shipped before 2025 were designed for .simg firmware. Key facts:

• Pre-2025 devices accept only .simg firmware by default.
• A transitional .simg firmware update is available that enables .pkg support on legacy devices.
• This transition is one-way — once upgraded to .pkg support, the device will no longer accept .simg files.
• A factory reset restores the device to its original firmware handling behavior (.simg acceptance).
• All new firmware releases from 2025 onward are in .pkg format only.

Mixed environments: If you manage both pre- and post-2025 QuickServers, plan updates carefully. Confirm device manufacturing date before applying firmware. Applying a .pkg image to an untransitioned legacy device will fail.

Post-2025 Devices

QuickServers manufactured after 2025 use .pkg firmware exclusively:

• Only .pkg firmware can be installed.
• .simg firmware is not supported under any circumstances.
• Downgrading to .simg support is not possible.

Determining Your Device’s Firmware Format

Check the device label or manufacturing date to determine if your QuickServer is pre- or post-2025. If you are unsure, contact Chipkin support with the model number and serial number.

Uploading Firmware

For QuickServer firmware upload steps, see How to Upload Firmware.