This "Chateau" series Quick Guide covers models: RBD53G-5HacD2HnD-TC&EG12-EA (Chateau LTE12)
This is Wireless Network Device. You can find the product model name on the case label (ID). 
Please visit the user manual page on https://mt.lv/um for the full up-to-date user manual. Or scan the QR code with your mobile phone.
First steps:
- Connect your computer to one of the Ethernet ports.
- Insert micro SIM card into the slot located under the device.
- Connect the power adapter to the DC jack.
- Open https://192.168.88.1 in your web browser to start the configuration.
- User name: admin and there is no password.
- Update the device by clicking the (Check_for_updates) on the right side and updating your RouterOS software to the latest version. Must have a valid SIM card inserted.
- To manually update the device, please go to https://mikrotik.com/download
- Choose v7 (ARM) packages for this device and download them to your PC.
- Upload downloaded packages to the (WebFig) (Files) menu and reboot the device.
- Updating your RouterOS software to the latest version will ensure the best performance, stability, and security updates.
- In the (QuickSet) menu set up the following: Choose your country, to apply country regulation settings.
- Set up your wireless network password in the left field.
- Set up your router password in the bottom field.