You get into the failsafe mode, when you power your box online and right after you push the reset button a few times.
But, as YOUR box still works, you don't really need a failsafe mode. It is only a common procedure for cases, where you don't get any access to the box.
The best way, is to follow the instructions I posted above (including the mtd command.) http://piratebox.cc/openwrt:reflash_wo_usb.
The mtd command for a MR3040v1 it would be:
Matthias
But, as YOUR box still works, you don't really need a failsafe mode. It is only a common procedure for cases, where you don't get any access to the box.
The best way, is to follow the instructions I posted above (including the mtd command.) http://piratebox.cc/openwrt:reflash_wo_usb.
The mtd command for a MR3040v1 it would be:
mtd -r write openwrt-ar71xx-generic-tl-mr3040-v1-squashfs-factory.bin firmware
Matthias