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Changing SIM and APN in GWBR1 CHEMTREAT Modems

Process for installing a new SIM into a Peplink Modem.

Updated over 2 weeks ago

Changing SIM and APN in GWBR1 CHEMTREAT Modems

Requirements:

To swap a SIM card on a Flight modem, you will need the following:

  • The new SIM card

  • A laptop*

  • An Ethernet cable

  • A small pin or the tip of a pen

    *If your laptop does not have an Ethernet port, a USB-to-Ethernet adapter will be required.

Setup Instructions:

  1. Check Connections:

    • Open the modem lid and ensure all cables are connected properly.

    • Attach the antennas to the side terminals.

  2. Insert new SIM Card:

    • Unscrew the SIM cover and then use a SIM pin or paper clip to open the SIM tray and insert the new SIM card.

  3. Power Up:

    • Plug the modem into a power outlet.

    • Wait for the lights to stop blinking and turn solid.

  4. Login:

    • Once the modem is ready, log in to the modem's settings.

Logging in to modem

  1. Connected your laptop to the LAN port of the modem using an ethernet cable.

  2. In your web browser, type 192.168.50.1:8080 and hit enter.

    1. If the Ethernet connection cannot be used, try to connect via WiFi using the password 8049352200

  3. You should see the Peplink login screen.

    1. Username : admin

    2. Password : Ch3mtr34t

Changing the APN.

  1. In the WAN Connection Status section, click on "Details."

  2. Delete the APN address in the APN field and replace it with the one that we provided on the sticker that came with the SIM. If unsure of the APN, call APS support for assistance.

3. Scroll to the bottom and click Save and Apply.

APPENDIX

Option if not able to connect to modem using 192.168.50.1. Important: If using a LAN connection, you may need to set your computer’s IP address to 192.168.50.10. Otherwise, you can skip this step.

Change IP Settings (if needed):

  1. Start → Settings → Network & Internet → Ethernet (or Wi-Fi if wireless).

  2. Click on the active connection.

  3. Scroll down → IP Settings → Edit.

  4. Choose Manual → IPv4 → On.

  5. Enter:

    • IP address: Something valid like 192.168.1.50 (or whatever your modem/router uses)

    • Subnet mask: Usually 255.255.255.0

    • Gateway: Your modem/router IP, like 192.168.1.1

    • DNS: 8.8.8.8 (Google DNS) or same as Gateway

Save. Done.

Photos of SIM Replacement Process

  • You will need:
    -Small screwdriver.
    -Laptop (Optional but very highly recommended) with an ethernet port or a USB to ethernet adapter.
    -SIM Card

Step 1: Unscrew the 4 screws attaching the gateway to the riser.


Step 2: Locate the SIM tray at the top of the gateway.


Step 3: Unscrew the cover over the SIM tray. Do not remove the screw all the way. The door should remain loosely attached.


Step 4: The SIM card should be positioned with the metal side facing you and the corner notch pointed down. Insert it into the SIM B Slot.


Step 5: Push the SIM into place until it clicks into place like a pen. If you ever need to remove the SIM card, push it in until it clicks and it will pop out of the SIM slot.


Step 6: Cover the SIM slots and use the small screw to slightly tighten the door into place.


​
Step 7: Screw the gateway back into place on the riser.

Related Articles
Changing SIM and APN in GWBR1 Modems
ChemTreat Modem and Things Mobile SIM Replacements - Support Team Instructions
SIM Replacement & APN Change for Peplink Modems
Connecting a Laptop to a Flight Modem or ModemMillie 2.0
Changing the SIM Card on a Flight Modem
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