After using the trailed initial flash build (the file with the router name in it) only use nv64k (or trailed) builds to upgrade with or you will brick your unit. Don't confuse this unit with some of the other Linksys E-Series units that use nv60k builds, this one uses nv64k builds!
If when flashing or changing settings on K3X builds (resetting), the e1500 boots to where the power light blinks about every second, set a static IP on your ethernet port and open the GUI. This is called a "Management Mode Firmware Upgrade" screen, which is a web interface to upload a firmware using a TFTP server built into the CFE (bootloader).
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