You can Download the latest signed OTA firmware for the Apple Watch Series 5 (44mm) (Watch5,2) from this page. Below you will find direct links to the latest 10 OTA Zip firmware files that will get updated automatically as soon as Apple seeds a new OTA update.
Note that this website used the ipsw.me API V4 to automatically get the OTA updates for the Apple Watch Series 5 (44mm) (Watch5,2) listed below. If you are using a VPN, you might not be able to download the firmware files.
Identifier: Watch5,2 Board 1 BoardConfig: N144bAP Platform: BDID: 0x12 CPID: 0x8006
The Apple Watch Series 5 was first introduced at Apple's "By Innovation Only" keynote on 10 September 2019. Internally, the Apple Watch Series 5 is referred to as N144sAP (Watch5,1 - 40mm), N144bAP (Watch5,2 - 44mm), N146sAP (Watch5,3 - 40mm Cellular) or N146bAP (Watch5,4 - 44mm Cellular).