First off don't use Chrome, we've need Chrome not handle FW updates well.
2ndly, you need to follow the FW update process linked in my posts to you. This is tried and true working process for upgrading FW on any router.
3rd, please try the recovery process to see if you can get the router back in operation again. Might as well while you wait on the shipping router.
4th, I would try upgrading FW with the router off line from the main network and disconnect ALL clients, wired and wireless while you do the upgrade.
Please review the FW Update process before you start. Use IE11 or FF. DO NOT USE CHROME!!!