Regain control of returned computer

When something looks stupid, it could be just plain stupidity or there might be hidden agenda. For example, if some mad people take away your modem and monitor along with your CPU on the pretext of police investigation, it is not likely they use them as dumbbells.

When the equipments are eventually returned, do not connect them to the existing network right away. They should be treated with suspicion until properly checked and dealt with.

You can use the followings as general guidelines.


For monitor, do the followings;

1. check for sign of casing being opened
2. visually inspect it for suspicious looking object such as listening device

For modem, do the followings;

1. update its firmware

NOTE:
- to update firmware, follow the instruction provided by the manufacturer


For router, do the followings (router could be built into the modem box);

1. update its firmware (for standalone router)
2. revert its settings to the manufacturer defaults
3. implement security for Wi-Fi access
   
4. use different password for Wi-Fi access (password different from the previous setting)

NOTE:
- sometimes router and modem are built as a single-box device. Basically, if your 'modem' can connect to multiple computers or have Wi-Fi feature, it's a modem+router box


For CPU/laptop, it's highly recommended that you reinstall the system;

1. visually inspect the hardware for suspicious looking device
2. update the motherboard's firmware
3. reinstall the operating system

However, if you are unable to reinstall your CPU/laptop, at least do the followings;

1. visually inspect the hardware for suspicious looking device
2. scan for planted spyware using proven software
3. check the firewall settings for suspicious setting (complete reset is recommended)
4. update the motherboard's firmware

NOTE:

• Only download firmware from the device manufacturer's site or reliable sources
  
• Firmware is a small program residing in the ROM (read-only memory) of electronic devices. It's used to control the internal working of the device.
• Firmware update is also known as "flashing the ROM"

IMPORTANT:
Make sure you use the correct firmware for each device. Firmware is specific to each make and model of the device. Different versions of the same model could also be using different firmwares.