I finally decided to return to the original firmware, and I succeded following this guide, and, particularly, following this other guide for restoring TP-Link firmwares.
Now my question is: does have some sense reflashing the complete firmware file, not that cut by me, to the router in order to get living the warranty?
And, in the future, in order to install a new released firmware, how should I treat that file? I will have to cut it as that guide for TP-Link router states?
Thanks for the support.