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I disagree about arguments regarding ethics or usefulness of flashing more featureful firmware. The Sprint router is given to the customer and not lent. Ownership and device fees are spelled out in the device manual. Other than removing Bridge and Repeater modes, there was no need for Sprint to disable the features they did in order to make WiFi Calling the top priority for QoS. Flashing Asus or aftermarket firmware doesn't stop my device from connecting to the router for Wifi Calling and Data in order to reduce traffic on Sprint's inadequate network. Just make Wifi Calling traffic top priority on your newly enabled QoS page. Google tells me it's on UDP port 4500, and you can check netstat logs during a Wifi Call to confirm this.

I saw that T-mobile released a firmware update that prevents you from installing Asus or aftermarket firmware using the CellSpot router's web interface. Are you saying that they released a newer update that also prevents you from flashing firmware in Recovery Mode using Asus's Firmware Restoration tool?

I found these directions for installing aftermarket firmware like Merlin or TomatoUSB to a RT-AC66u: http://www.shadowandy.net/2013/10/upgrading-asus-rt-ac66u-tomatousb.htm Seems you can put the router in Recovery Mode by holding the Reset pin for 30 seconds while powering up the router. Once the Power LED starts flashing, run the Asus Firmware Restoration tool on your computer connected to LAN1 over ethernet with DHCP enabled. After the flash, clear the NVRAM by holding the WPS button while powering up. Tada! The directions are the same as installing unlicensed firmware to the T-mobile CellSpot (RT-AC68u): http://www.pocketables.com/2014/09/flash-firmware-t-mobile-cellspot-wifi-router.html Who wants to try and report back?

Has anyone discovered how to flash Asus's OEM firmware to this device? Is it possible to put the Sprint WiFi Connect into Rescue Mode and use Asus's Firmware Restoration tool in order to bypass the router's firmware signing? Current WiFi Connect firmware: 3.0.0.4.378_4443-ge73b6a7 Current RT-AC66u Beta firmware: 3.0.0.4.378.4850