Signed
watchOS 6.3.1 (17U224) is signed
Apple's signing server is signing this firmware, so you can restore or update to it now. Checked with Apple .
Signed since release, Jul 27, 2026. Apple lists it until Feb 3, 2027.
Released July 27, 2026
Download OTA 1.5 GB
From updates.cdn-apple.com (Apple). Signet never hosts files.
Restore images (IPSW) 4
| Version | Released | Status | Expires | Size | |
|---|---|---|---|---|---|
| watchOS 6.3.1 17U224 OTA | Jul 27, 2026 | Signed Signed by Apple Signed since release, Jul 27, 2026. Apple lists it until Feb 3, 2027. Apple doesn't publish signing end dates; Signet records them by checking on a schedule. | Apple's listed expiration Apple's update server (gdmf.apple.com) lists this build until February 3, 2027. Apple can stop signing it sooner, usually a week or two after the next release. | 1.5 GB | |
| watchOS 6.3.1 17U224 OTA | Jul 27, 2026 | Signed Signed by Apple Signed since release, Jul 27, 2026. Apple lists it until Feb 3, 2027. Apple doesn't publish signing end dates; Signet records them by checking on a schedule. | Apple's listed expiration Apple's update server (gdmf.apple.com) lists this build until February 3, 2027. Apple can stop signing it sooner, usually a week or two after the next release. | 1.5 GB | |
| watchOS 5.3.10 16U711 OTA | Jul 27, 2026 | Signed Signed by Apple Signed since release, Jul 27, 2026. Apple lists it until Feb 3, 2027. Apple doesn't publish signing end dates; Signet records them by checking on a schedule. | Apple's listed expiration Apple's update server (gdmf.apple.com) lists this build until February 3, 2027. Apple can stop signing it sooner, usually a week or two after the next release. | 1.4 GB | |
| watchOS 5.3.10 16U711 OTA | Jul 27, 2026 | Signed Signed by Apple Signed since release, Jul 27, 2026. Apple lists it until Feb 3, 2027. Apple doesn't publish signing end dates; Signet records them by checking on a schedule. | Apple's listed expiration Apple's update server (gdmf.apple.com) lists this build until February 3, 2027. Apple can stop signing it sooner, usually a week or two after the next release. | 1.4 GB |
Over-the-air updates 2
The exact packages Apple's update server offers this device. Encrypted (.aea) packages list the key Apple publishes with them.
Specifications
- Chip
- Dual-core processor
- Display
- Second-generation OLED Retina display with Force Touch 2x brighter (1000 nits)
- 272 by 340 pixels (38mm)
- 312 by 390 pixels (42mm)
- Battery
- Up to 18 hours
- Water resistance
- Water resistant 50 meters
- Size & weight
- 33.3 × 11.4 mm
- 36.4 mm
- 34 × 11.8 mm
- 36.5 mm
Source: Apple Tech Specs