---
title: System software PUP — defined | Meridian
description: Definition: PS5UPDATE.PUP is Sony's official PlayStation 5 system-software file, installed in Meridian via File → Install Firmware.
canonical: https://ps5emulatorwindows.com/lexicon/system-software-pup
updated: 2026-10-13
---

# System software PUP

PUP (n.): Sony's official PS5 system-software file. The only firmware Meridian accepts.

## Facts (2026-10-13)

- **Term:** PUP — PlayStation Update Package
- **File:** PS5UPDATE.PUP, official, unmodified
- **Source:** Sony's system-software page
- **Install:** File → Install Firmware

## Definition

PUP (PlayStation Update Package): Sony's official, signed system-software file for PlayStation 5. In Meridian's docs, PUP always means the unmodified PS5UPDATE.PUP fetched from Sony's system-software page — never a patched, partial, or renamed file.

Meridian verifies the file on install and rejects anything else. Verification failure means the download was truncated or tampered with; the fix is a fresh download, never a patch.

## Usage

- Install via File then Install Firmware per [Install firmware](/protocol/install-firmware).

- Confirm via the firmware version string in About. No version, no boot.

- Meridian ships with no PUP. Own your library; fetch firmware yourself from Sony.

Free build: [Download Meridian](/download). 400+ owned titles recognized once firmware is present.

## FAQ

### Is the PUP the same as the emulator?

No. Meridian is the launcher; the PUP is Sony's official system software that Meridian boots.

### Why must it be unmodified?

System behavior must match the console bit for bit. Modifications break that contract and fail verification.

### Where is the install procedure?

In [Install firmware](/protocol/install-firmware): official PUP, File then Install Firmware, confirm version.

## Related

- [Lexicon](https://ps5emulatorwindows.com/lexicon)
- [Install firmware](https://ps5emulatorwindows.com/protocol/install-firmware)
- [Boot system software](https://ps5emulatorwindows.com/protocol/boot-system-software)
- [How it works](https://ps5emulatorwindows.com/reference/how-ps5-emulator-works)
- [RDNA2 and SPIR-V](https://ps5emulatorwindows.com/lexicon/rdna2-spir-v)

## Download

Free Windows app: [Download Meridian](https://ps5emulatorwindows.com/download)

Markdown mirror: https://ps5emulatorwindows.com/lexicon/system-software-pup.md