Step-by-Step Fix: Restore Stable Wi-Fi Connection
🔹 1. Reset Wi-Fi Setup Mode
This clears old credentials and puts the printer in pairing mode.
- Press and hold the Wireless button 📶 and the Cancel button ❌ for 3 seconds
- Wait for the blue wireless light to blink slowly—this means it’s ready to connect
🔹 2. Use HP Smart to Reconnect
- Open the HP Smart app on your Windows PC
- Click “Add Printer”
- Select your M140w from the list
- Enter your Wi-Fi credentials (SSID + password)
- The app will send them to the printer and complete setup
⚠️ Make sure your PC is on the same Wi-Fi network and that your T-Mobile gateway is broadcasting 2.4GHz (some HP printers don’t support 5GHz).
Set Static IP Directly on the HP Printer
This is the simplest and most reliable method given T-Mobile’s restrictions.
Steps:
- Access the printer’s control panel (or web interface if it’s networked).
- Navigate to Network Settings → TCP/IP Settings.
- Disable DHCP and manually assign:
- IP address: Choose one outside the DHCP pool (e.g., if DHCP range is 192.168.12.100–200, pick 192.168.12.50).
- Subnet mask: Usually 255.255.255.0.
- Gateway: Use the IP of your T-Mobile gateway (typically 192.168.12.1).
- DNS: You can use public DNS like 8.8.8.8 or 1.1.1.1.
This avoids relying on the router to reserve IPs, which T-Mobile’s firmware doesn’t support well.