The url of the OTA_PACKAGE is Edit now withdrawn.
Replaced by e-3.1.3
You can download this on the phone to a known location.
System updater > 3 dot top right menu > Local update > navigate to the file and apply.
The update can also be applied from a PC by
adb sideload e-3.1.2-a15-20250903521531-official-FP6.zip