Fresh install of 57.2 never passes "Preparing" stage

I’m trying a fresh install on a Pi-zero W using the basic instructions on the getting started page.
Everything works fine and I can connect to hassio.local:8123 but that leaves me at the Preparing Hass.io page. I’ve given it overnight, and confirmed that there is no network traffic to the Hass box.

I set up SSH via this page: https://home-assistant.io/developers/hassio/debugging/ and checked the logs. The only logs produced indicate a 404 error pulling the 57.2 image.

-- Logs begin at Mon 2017-09-18 09:46:49 UTC. --
Sep 18 09:47:52 hassio start-resin-supervisor[952]: 17-09-18 09:47:52 INFO (MainThread) [hassio.core] HassIO reboot detected
Sep 18 09:47:52 hassio start-resin-supervisor[952]: 17-09-18 09:47:52 INFO (MainThread) [hassio.homeassistant] Setup HomeAssistant
Sep 18 09:47:52 hassio start-resin-supervisor[952]: 17-09-18 09:47:52 INFO (SyncWorker_4) [hassio.dock.interface] Pull image homeassistant/raspberrypi-homeassistant tag 0.57.2.
Sep 18 09:47:53 hassio start-resin-supervisor[952]: 17-09-18 09:47:53 INFO (MainThread) [hassio.addons] Load addons: 17 all - 0 new - 0 remove
Sep 18 09:54:13 hassio start-resin-supervisor[952]: 17-09-18 09:54:13 ERROR (SyncWorker_4) [hassio.dock.interface] Can't install homeassistant/raspberrypi-homeassistant:0.57.2 -> 404 Client Error: Not Found ("no such image: homeassistant/raspberrypi-homeassistant:0.57.2: No such image: homeassistant/raspberrypi-homeassistant:0.57.2").
Sep 18 09:54:13 hassio start-resin-supervisor[952]: 17-09-18 09:54:13 WARNING (MainThread) [hassio.homeassistant] Error on install HomeAssistant. Retry in 60sec
Sep 18 09:54:28 hassio start-resin-supervisor[952]: 17-09-18 09:54:28 ERROR (MainThread) [hassio.tasks] Watchdog found a problem with Home-Assistant docker!
Sep 18 09:54:28 hassio start-resin-supervisor[952]: 17-09-18 09:54:28 INFO (SyncWorker_3) [hassio.dock.interface] Clean homeassistant/raspberrypi-homeassistant docker application
Sep 18 09:54:40 hassio start-resin-supervisor[952]: 17-09-18 09:54:40 INFO (SyncWorker_3) [hassio.dock.homeassistant] Start homeassistant homeassistant/raspberrypi-homeassistant with version landingpage
Sep 18 09:55:13 hassio start-resin-supervisor[952]: 17-09-18 09:55:13 INFO (SyncWorker_3) [hassio.dock.interface] Pull image homeassistant/raspberrypi-homeassistant tag 0.57.2.