Innosilicon have changed the root password in the 22nd Dec firmware release
root access is no longer supported until the new root password is cracked
Root access is the only way I could repair my A4+, since there IS NO TF card slot, none of my miners can be flashed when they fail.
I've had to repair the software on one miner every day, so far. So, not looking good for the future of these things.