Im having the same issue. I have tried versions as old as the newest release to r37961 to r27XXX
I have started with am OEM firmware bases of 1.11 1.13 1.15 , each one failed, and it fails pretty early on, the power led switches from orange (25 seconds) to white (1 second) to off (2 seconds). I have also tried resetting to factory defaults before flashing dd-wrt . It looks like the device is restarting, the network connection even drops. But when it is up it still hands out the old address 192.168.0.125 not something like 192.168.1.125 which I would have expected.
Its weird I had flashed this device before and I didnt have these issues....
Any thoughts ?
nz