Step-by-step Wi-Fi setup on the ByFly Promsvyaz modem: from logging into the panel to signal boosting

• Login: admin or user
• Password: admin, user, password or an empty field.

If the default credentials don't work, check the sticker on the back of the modem - it may contain unique credentials. On models M200A Sometimes a password like this is used byflyXXXX, Where XXXX — the last 4 digits of the serial number.

⚠️ Attention: After three unsuccessful attempts to enter the password, the modem Promsvyaz may block access for 5 minutes. In this case, wait or reboot the device using the button Reset (hold for 10 seconds).

☑️ Preparing to log in to the control panel

Check the modem's IP addressConnect via cable (recommended)Disable VPN/proxyWrite down the current Wi-Fi SSID and password

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3. Basic Wi-Fi setup: changing the network name (SSID) and password

After successfully logging into the control panel, go to the section Wireless or Wi-Fi (depending on the model). The interface may differ, but the general logic remains the same:

1. Select a tab Basic Settings (Basic settings).
2. In the field SSID Enter a new network name (eg. MyByFly_WiFi_5G). Avoid Cyrillic and special characters—some devices (especially older smartphones) may not connect to such networks.
3. In the section Security (Security) install:
   • Authentication type: WPA2-PSK (recommended) or WPA3-PSK (if supported).
   • Encryption version: AES (do not use TKIP - this is an outdated standard!).
   • Password: at least 8 characters, with a combination of letters, numbers and symbols (e.g. ByFly_2026!WiFi).
• Click Save or Apply to save.

On Promsvyaz M500 models, changing the Wi-Fi password automatically updates the password for the guest network (if enabled). This may result in disconnection of devices connected to the guest network.

Parameter	Recommended value	Explanation
Channel Width	20/40 MHz (for 2.4 GHz) 80 MHz (for 5 GHz)	Channel width affects speed and stability. In apartment buildings, it is better to use 20 MHz for 2.4 GHz to avoid interference.
Mode	802.11n/g/b (2.4 GHz) 802.11ac (5 GHz)	Mode 802.11ac provides high speed, but older devices may not support it.
Beacon Interval	100	Signal sending interval (in ms). Decreasing this value can improve stability but will increase network load.

4. Choosing the optimal Wi-Fi channel: how to avoid interference

One of the main problems in apartment buildings is 2.4 GHz channel congestionIf your Wi-Fi is slow or drops out intermittently, it could be because your neighbors are using the same channel. To find a free channel:

1. Install a Wi-Fi analyzer app on your smartphone, for example, WiFi Analyzer (Android) or NetSpot (iOS).
2. Run a scan and see which channels are the least loaded (they will be marked in green or blue on the graph).
3. Go back to the modem control panel, to the section Wireless → Channel.
4. Select a channel manually (Manual) and indicate a free number (for example, 1, 6 or 11 for 2.4 GHz).

For the range 5 GHz The situation is simpler—there are more channels here, and they are less susceptible to interference. Optimal channels: 36, 40, 44, 48 (lower range) or 149–165 (upper range, if supported). On models Promsvyaz M300B and newer function is available Auto Channel Selection - It automatically selects the least loaded channel, but it does not always work correctly.

⚠️ Attention: In Belarus, channels with 5 GHz are allowed 36 By 64 and with 100 By 140 (power up to 200 mW). Using other channels may violate local regulations and cause interference to neighboring networks.

How to check if your modem supports 5GHz?

Open Control Panel and go to Wireless → Basic SettingsIf there is an option there 5GHz Network or Dual Band, which means the range is supported. On models M200A and old firmware M300B 5GHz may be disabled by default - enable it manually.

5. Setting up a guest network and access control

A guest network is useful if you want to provide internet access to visitors without revealing the password to your main network. On the modem Promsvyaz It is configured like this:

1. Go to Wireless → Guest Network.
2. Activate the option Enable Guest Network.
3. Specify a network name (eg. Guest_ByFly) and password.
4. In the section Access Control You can:
   • Limit the speed for guests (for example, to 10 Mbps).
   • Set the network schedule (for example, only with 9:00 to 22:00).
   • Block access to local resources (printers, network drives).

For added security, please enable this feature. MAC Filtering (MAC address filtering). This allows you to restrict connections to specific devices:

1. Find the MAC addresses of your gadgets (on a smartphone: Settings → About phone → Status).
2. In the modem panel, go to Wireless → MAC Filter.
3. Add addresses to the "white list" (Allow) and activate filtering.

Please note: MAC filtering is not a reliable protection — An experienced user can spoof the MAC address. This is only useful for basic access control.

6. Troubleshooting common Wi-Fi issues on a Promsvyaz modem

Even after proper setup, ByFly users still encounter common errors. Let's look at the most common ones and their solutions:

• 🔄 Wi-Fi disconnects periodically:
  • Check if the modem is overheating (place it in a ventilated area).
  • Turn off Wi-Fi power saving in Settings (Wireless → Advanced → DTIM Interval install in 3).
  • Update your modem firmware (section System Tools → Firmware Upgrade).
• 🐢 Slow Wi-Fi speed:
  • Switch from 2.4 GHz on 5 GHz (if the device supports it).
  • Reduce the channel width to 20 MHz in the settings 2.4 GHz.
  • Disable devices that consume background traffic (cloud backups, OS updates).
• 🚫 Devices do not connect to the network:
  • Check if the mode is enabled WPS - it can block manual connection.
  • Reset network settings on your device (on Android: Settings → Wi-Fi → Forget network).
  • Make sure your password does not contain spaces at the beginning or end.

If the problem persists, reset the modem to factory settings:

1. Press and hold the button Reset (usually located on the rear panel) during 15 seconds.
2. Wait for the reboot (the indicators should light up in standard mode).
3. Connect via cable and repeat the setup from scratch.

⚠️ Attention: On models Promsvyaz M500 A factory reset may result in the loss of your ByFly account link. In this case, you will need to reactivate the service through your personal account or call support.

7. Advanced settings: signal boosting and optimization

If the default settings do not provide sufficient coverage, try the following methods:

• 📶 Increasing transmission power:
  • In the section Wireless → Advanced find the parameter Transmit Power.
  • Set value High or 100% (by default it is often Medium).
• 🔄 Setting up Roaming Assist (for dual-band modems):
  • Activate the option Band Steering - it automatically switches devices between 2.4 GHz And 5 GHz for optimal speed.
• 🛡️ Disabling unnecessary features:
  • Turn it off WPS (insecure protocol).
  • Turn it off IGMP Snooping (if you do not use IPTV).

To improve signal in a larger home or office, consider using Wi-Fi repeater. Modems Promsvyaz support modes WDS (wireless connection to another router) and Bridge (cable connection). WDS setup:

1. In the control panel, go to Wireless → WDS.
2. Turn on the mode Enable WDS.
3. Specify the MAC address of the second router (repeater).
4. Set the same channel and security type as your main modem.

If you use Mesh system (for example, TP-Link Deco or Keenetic), connect it to the modem Promsvyaz in mode AP (access point), disabling DHCP on Mesh devices.

8. Updating firmware and backing up settings

Regular modem firmware updates fix bugs, improve stability, and add new features. To update the firmware:

1. Go to System Tools → Firmware Upgrade.
2. Click Check Update — the modem will check for new versions on the ByFly server.
3. If an update is available, click Upgrade and wait until it completes (do not turn off the power!).

Before the update Be sure to back up your current settings.:

1. Go to System Tools → Backup & Restore.
2. Click Backup — the settings file will be saved to your computer.

If the modem stops working correctly after the update, restore the settings from a backup or perform a factory reset. On models M300B And M500 firmware rollback function is available (Firmware Rollback), but it only works for 24 hours after the update.

⚠️ Please note: Firmware update details may vary depending on your provider's policies. You can always check the latest firmware version and instructions in your ByFly account or by contacting support.

FAQ: Frequently asked questions about setting up Wi-Fi on a Promsvyaz modem

My Promsvyaz modem isn't assigning an IP address over Wi-Fi. What should I do?

The issue may be related to a disabled DHCP server. Check:

1. In the control panel, go to Network → LAN.
2. Make sure the option is DHCP Server included (Enable).
3. Check the range of addresses issued (for example, 192.168.1.100–192.168.1.199).

If the settings are correct but the problem persists, try manually setting the IP address on the device (for example, 192.168.1.10 with a mask 255.255.255.0 and a gateway 192.168.1.1).

How do I enable 5 GHz on the Promsvyaz M300B modem?

On this model, 5 GHz may be disabled by default. To enable it:

1. Go to Wireless → 5GHz Network.
2. Install Enable 5GHz in position On.
3. Set up a network name (SSID) and password (other than 2.4 GHz to avoid conflicts).
4. Save the settings and reboot the modem.

If option 5GHz Network missing, update the modem firmware to the latest version.

Is it possible to use the Promsvyaz modem in Bridge mode?

Yes, but with some reservations:

• Mode Bridge disables the router function, and the modem starts working as a "transparent bridge", transmitting the Internet to another device (for example, your router).
• On models M200A And M300B The bridge mode is configured in Network → WAN → Connection Type (select Bridge).
• Once the Wi-Fi bridge is activated, the modem will be disabled and will need to be configured on the connected router.

Please note that in bridge mode, some ByFly services (e.g. IPTV) may not work correctly.

Why does IPTV stop working after changing the Wi-Fi password?
This is due to the fact that some modem models Promsvyaz Link IPTV settings to the main Wi-Fi network. Solutions:
• Check what's in the section Network → IPTV the correct one is indicated VLAN ID (usually 4001 for ByFly).
• If IPTV is connected via Wi-Fi, reconnect the set-top box to the network with a new password.
• As a last resort, reset your modem to factory settings and set up IPTV again.
How to limit internet speed for specific devices?

Function QoS (Quality of Service) allows you to limit speed by MAC address or IP. Setting:

1. Go to Advanced → QoS.
2. Turn on Enable QoS.
3. Add a rule by specifying the MAC address of the device and the speed limit (e.g. 5 Mbps).
4. Save the settings and reboot the modem.

Please note: QoS This only works for devices connected to a modem. If you use an additional router, you'll need to duplicate the settings there.