I have to say, the TFTP saved my day 
.
In case your linksys router seems to be a brick, you have to calm down and try this few steps, they have worked for me.
1. Connect your machine with the router using a ethernet cable (Disconnect the router from the internet);
2. Edit your connections settings in order to have an IP address like 192.168.1.2 (e.g) and the gateway 192.168.1.1;
3. Now, your router is pingable;
4. You need to activate your TFTP client (go to control panel, add/remove features) and activate this feature;
5. Now, you need to transfer the firmware from your PC to the router, how ?, just with one command!
tftp -i 192.168.1.1 PUT code.bin code.bin
where ‘code.bin’ is the TFTP version of the firmware, go to the DDWRT website (e.g) and download it.
6. After a minute (more or less) your power button stops flashing, and that’s it.
Your router is no longer a brick, and in fact it’s alive!!
