# Amazon Kindle Update Package — file signature 53 50 30 31 at offset 0

For Amazon Kindle Update Package, hex signature is 53 50 30 31; offset is 0; extension is bin, verified against its source on 2026-09-22.

- **Hex signature:** 53 50 30 31 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** bin _(verified: appears in the quote below)_
- **Format:** Amazon Kindle Update Package _(verified: appears in the quote below)_

## What the source says

> 53 50 30 31 | SP01 | 0 | bin | Amazon Kindle Update Package [6] |

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).