For DVR and NVR, following are the default accounts:
admin/admin admin/123456 (master account of local and network accessing)
888888/888888 (local administrator)
666666/666666 (restricted user)
default / default (hidden user)

Default IP Address, Username and Password Bosch:
For old models:
Username: service
Password: service
IP Address: 192.168.0.1
For new models:
You can reset the camera by pushing the reset button about 7 seconds. Or you can reset the NVR by removing the battery on the mainboard (not recommended, at your own risk)

Read More https://www.itsmarttricks.com/all-cctv-brand-default-ip-address-username-and-password/