So I struggled and struggled with google searches and the seller for the DS-2CD2335-I cameras I bought. Everything said the password would be 123456789abc. I tried all other iterations of the default password. Then before I gave up, I tried 123456789ABC (Caps on the ABC) and it worked. So for the record, the two cameras I got had the ABC part in caps. I got some bullet cameras from the same seller and it was lowercase!