What is the PUP file format?
.pup files (PlayStation Update Package) are packages of files used in the process of updating Sony firmware across PlayStation systems, including the PSP, PlayStation 3, PlayStation 4, PlayStation 5, and PlayStation Vita. A .pup package may include patches for security measures or errors, modified or completely new system settings, and additional options.
Each .pup is a signed, encrypted container developed by Sony Interactive Entertainment - not intended to be user-editable, though third-party tools can extract and inspect the internal file segments.
Types of .pup files
PS3 .pup files come in two functional kinds: patch-only packages named PS3PATCH.PUP, and full-update packages named PS3UPDAT.PUP. Four console-variant editions are also distinguished:
- Retail/CEX
- Shop/SEX
- Debug/DEX
- Tool/DECR
The Retail/CEX edition includes two size variants: a standard-size release also published online by Sony, and a padded variant where zeros are appended so the file reaches 256 MB.
PS4 and PS5 updates share the .pup extension but use different internal structures and stronger encryption. PS3 packages begin with the ASCII magic SCEUF (hex 53 43 45 55 46) at byte offset 0; later-generation packages do not share this header.
Additional information
.pupfiles for a given firmware version are region-universal - the same package applies worldwide.- On Windows, the contents of a PS3
.pupcan be inspected using the PS3 PUP Extractor tool. - A
.pupupdate can be copied to a PlayStation 3 from a USB storage device or downloaded directly from the internet; it must be placed in the/PS3/UPDATE/directory on the storage device. PS4 and PS5 updates use/PS4/UPDATE/and/PS5/UPDATE/respectively. - Related formats include .PKG content packages and .BIN firmware images.
Security & safety
RISK: MEDIUMOfficial PlayStation .pup files from playstation.com are safe - they're signed and the console verifies them. The real dangers are around UNOFFICIAL firmware: modified or 'custom firmware' .pup files from forums can brick a console, and interrupting an update (power loss, removing the USB) mid-install can corrupt the system. Always download firmware only from Sony's official support pages, use a stable power source, and follow the exact folder/filename.
Format details
in a nutshell- Puppy Linux DotPup installer - A self-installing package (shell script, often gzipped) for the Puppy Linux distro - unrelated to PlayStation, now mostly replaced by .pet, and only meaningful on Puppy Linux.
Programs that open PUP files
Windows1 app
PS3 PUP Extractor
Free For inspection only: extract a PS3 .pup's internal segments on Windows. Will NOT let you edit or run the firmware. 
Sony PlayStation console (PS3/PS4/PS5)
Built-in The real 'opener': copy the .pup to a FAT32 USB in Sony's required folder, then run System Update / Reinstall System Software on the console. Technical details
deep spec| Container type | Signed, encrypted firmware-update archive |
| Magic bytes (PS3) | `SCEUF` - ASCII sequence hex `53 43 45 55 46` at byte offset 0 |
| Developer | Sony Interactive Entertainment |
| Supported platforms | PSP, PlayStation 3, PlayStation 4, PlayStation 5, PlayStation Vita |
| MIME type | `application/octet-stream` |
| PS3 functional sub-types | `PS3PATCH.PUP` (patch only) and `PS3UPDAT.PUP` (full firmware update) |
| PS3 console-variant editions | Retail/CEX, Shop/SEX, Debug/DEX, Tool/DECR |
| Retail/CEX padded variant | Standard content followed by zero-padding to reach exactly 256 MB |
| Update directory (PS3) | `/PS3/UPDATE/` on USB storage or internal system storage |
| Update directory (PS4/PS5) | `/PS4/UPDATE/` and `/PS5/UPDATE/` respectively |
| Region behaviour | Region-universal; a single `.pup` file applies to all regions for a given firmware version |
| Internal layout | Segment-based header storing segment count, individual offsets, and sizes; payload segments are encrypted |
| Encryption | Payload encrypted with AES; package authenticity enforced by RSA digital signature |
| Windows extraction | PS3 PUP Extractor can unpack PS3 `.pup` segment contents on Windows |
| Released | PlayStation .pup with PSP/PS3 (PS3 launched 2006); used through PS4/PS5/Vita |
| Specification | www.psdevwiki.com |
PUP conversions
Community Q&A
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