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docs: add official GoPro firmware URL format documentation (refs #60 #64 #66)
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‎docs/GOPRO_OFFICIAL_URL_FORMAT.md‎

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# GoPro Official Firmware URL Format
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## Overview
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GoPro official firmware files follow a predictable URL pattern on their CDN server, making it possible to understand and potentially construct URLs for firmware versions.
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## URL Format
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```
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https://device-firmware.gp-static.com/{DEVICE_ID}/{HASH}/{VERSION}/camera_fw/{FW_VERSION}/UPDATE.zip
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```
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## Pattern Components
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### Base URL
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- **CDN**: `https://device-firmware.gp-static.com/`
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### Device ID
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Each GoPro model has a unique device ID:
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- **50**: HERO8 Black
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- **51**: GoPro MAX
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- **55**: HERO9 Black
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- **57**: HERO10 Black / The Remote (older)
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- **58**: HERO11 Black
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- **60**: HERO11 Black Mini
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- **62**: HERO12 Black
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- **65**: HERO13 Black
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- **66**: HERO (2024)
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- **1000**: The Remote (newer)
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### Hash
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A unique hash identifier for each firmware version (appears to be SHA-1 or similar)
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### Version
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The camera firmware version in format `HXX.XX` (e.g., `H22.01`, `H19.03`)
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### Firmware Version
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The specific firmware version in format `XX.XX.XX` (e.g., `01.10.00`, `02.32.00`)
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### File Extension
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- **UPDATE.zip**: Standard firmware files
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- **GP_REMOTE_FW_XX_XX_XX.bin**: Remote firmware files
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## Examples
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### HERO11 Black H22.01.01.10.00
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```
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https://device-firmware.gp-static.com/58/9eda9f71cbceda591d1563d9696df743a1200638/H22.01/camera_fw/01.10.00/UPDATE.zip
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```
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### GoPro MAX H19.03.02.00.00
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```
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https://device-firmware.gp-static.com/51/029419def60e5fdadfccfcecb69ce21ff679ddca/H19.03/camera_fw/02.00.00/UPDATE.zip
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```
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### HERO13 Black H24.01.02.02.00
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```
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https://device-firmware.gp-static.com/65/1dc286c02586da1450ee03b076349902fc44516b/H24.01/camera_fw/02.02.00/UPDATE.zip
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```
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## URL Pattern Analysis
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### Device ID Mapping
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| Model | Device ID | Example Version |
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|-------|-----------|-----------------|
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| HERO8 Black | 50 | HD8.01.02.50.00 |
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| GoPro MAX | 51 | H19.03.02.00.00 |
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| HERO9 Black | 55 | HD9.01.01.60.00 |
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| HERO10 Black | 57 | H21.01.01.30.00 |
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| HERO11 Black | 58 | H22.01.01.10.00 |
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| HERO11 Black Mini | 60 | H22.03.02.00.00 |
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| HERO12 Black | 62 | H23.01.02.32.00 |
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| HERO13 Black | 65 | H24.01.02.02.00 |
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| HERO (2024) | 66 | H24.03.02.20.00 |
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| The Remote | 1000 | GP.REMOTE.FW.02.00.01 |
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### Version Format Conversion
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Convert firmware version `H22.01.01.10.00` to URL format:
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- **Version**: `H22.01` (first two parts)
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- **Firmware Version**: `01.10.00` (last three parts)
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## Key Observations
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1. **Consistent Structure**: All URLs follow the same pattern with device-specific IDs
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2. **Hash-based Security**: Each firmware has a unique hash for integrity verification
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3. **Version Mapping**: Clear relationship between firmware version and URL structure
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4. **CDN Distribution**: Uses GoPro's static CDN for reliable delivery
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5. **File Naming**: Standardized as `UPDATE.zip` for cameras, `.bin` for remotes
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## Usage Notes
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- **Hash Uniqueness**: Each firmware version has a unique hash that cannot be predicted
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- **Device Specificity**: Device IDs are model-specific and consistent
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- **Version Correlation**: URL structure directly maps to firmware version numbers
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- **CDN Reliability**: Uses GoPro's official CDN for high availability
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## Comparison with Labs Firmware
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| Aspect | Official Firmware | Labs Firmware |
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|--------|-------------------|---------------|
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| Base URL | `device-firmware.gp-static.com` | `media.githubusercontent.com` |
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| Device ID | Numeric (50, 58, etc.) | Model name (HERO11, MAX, etc.) |
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| Hash | Unique per version | Not used |
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| Version Format | `HXX.XX/camera_fw/XX.XX.XX` | `LABS_MODEL_XX_XX_XX` |
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| Predictability | Hash not predictable | Fully predictable |
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This pattern analysis helps understand how GoPro organizes their official firmware distribution and could be useful for firmware discovery and validation.

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