@oumlaut: Unless you switched to OpenSSH, the fact that it *rejects* a password tells me you might simply not be connecting to the right IP

.
The default setup uses dropbear and will accept *any* input as the password (so, just hit enter).
(Keep in mind swapping the config manually is *not* safe outside of USBMS mode. i.e., doing it live over SSH will result in undefined behavior).