Reflashing your MTS router to any SIM card: from unlocking to installing custom firmware

Routers from MTSSIM cards included with SIM-linked plans often block the use of cards from other providers. This restriction is implemented at the firmware level—the firmware checks the SIM card's IMSI number and refuses connection if it doesn't belong to the provider. MTSHowever, technically most of these devices (for example, ZTE MF920V, Huawei E5577Cs-321 or Sercomm L100) support work with any operators - you just need to remove the software blocking.

The process of flashing the firmware requires care: incorrect actions can brick the router. But with the right approach, you'll get a fully functional device, unbound to MTS, with the ability to use SIM cards MegaFon, Beeline, Tele2 or even foreign operators. In this article, we'll cover every step—from checking compatibility to selecting and installing alternative firmware.

⚠️ Warning: Modifying the router firmware may void your warranty. MTSIf your device is leased or on credit, check the unlocking option in your personal account or with your carrier—some plans allow official unlocking for a fee.

1. Check the router model and lock type

Before you begin flashing the firmware, you need to accurately determine your router model and lock type. MTS are divided into two categories:

• 🔒 Hardware-locked — they have a SIM-lock module installed at the chip level (rarely found in older models before 2018). Such routers cannot be unlocked using software.
• 📱 Software-blocked — the limitation is built into the firmware (90% of modern devices). They can be re-flashed to universal software.

To find out the model, look at the sticker on the back of the router or go to the web interface at 192.168.1.1 (default logins/passwords are usually admin/admin or admin/mts). Look for the line Model Name or Hardware VersionPopular models for unlocking:

If your model is not listed in the table, check it on forums like 4PDA or WiFiGid — they often post instructions for rare devices there. Pay attention to the hardware version (for example, Huawei E5577Cs-321 may have revisions V1, V2 etc.), since the firmware for them is not always compatible.

2. Preparing for flashing: backup and tools

Reflashing is always a risk. To minimize losses, follow these steps:

1. Save current settingsIn the router's web interface, find the section System Tools → Backup & Restore (or similar) and download the configuration file. This will help you quickly restore your network if something goes wrong.
2. Write down the IMEI. Enter in the address bar of your browser. 192.168.1.1/html/imei.html (For Huawei) or check via command AT+CGSN in the terminal (for ZTE). IMEI may be needed for recovery after an unsuccessful firmware update.
3. Prepare the tools:
   • 🔧 Program DC-Unlocker (for unlocking by code or changing IMEI).
   • 📁 Firmware for your model (download only from trusted sources!).
   • 🔌 USB cable (for connecting the router to a PC in wireless mode) Modem Mode).

For models Huawei Additionally you will need:

• 🔑 Unlock code (can be purchased on specialized websites or calculated via Huawei Code Calculator by IMEI).
• 📥 Program Balong USB Downloader for emergency firmware.

Critical Information: If your router ZTE MF920V with firmware version BD_MF920VV1.0.0B09 For devices newer than this, standard unlocking methods using DC-Unlocker may not work. In this case, you'll need a soldering iron to remove the jumper on the board or a specialized programmer.

3. Methods of unlocking without flashing

A complete firmware update isn't always necessary. For some models, a software reset is sufficient:

Method 1: Unlocking via DC-Unlocker (for ZTE and Huawei)

This program allows you to generate an unlock code or remove restrictions directly. Instructions:

1. Connect the router to the PC in mode Modem Mode (in the router settings, select Only Modem).
2. Launch DC-Unlocker, select manufacturer (Huawei or ZTE) and press Search.
3. If the device is detected, click UnlockThe program will either request a code (which must be purchased or calculated) or automatically reset the lock.

Method 2: Changing the IMEI (for Huawei E5577 and similar devices)

Some routers Huawei SIM cards are blocked by linking their IMEI to a carrier. To bypass this:

1. Download the program Huawei IMEI Tool.
2. Connect the router to your PC, launch the utility, and enter a new IMEI (you can generate a random one or take one from another unlocked device).
3. Restart your router. It should now accept any SIM card.

⚠️ Warning: Changing your IMEI may be considered illegal in some countries (for example, in Russia, this is regulated by Article 13.3 of the Code of Administrative Offenses). Use this method at your own risk, only if other methods have failed.

What should I do if DC-Unlocker doesn't detect my router?

1. Check if the drivers for your device are installed (download from the manufacturer's website).

2. Try connecting the router to a different USB port (preferably USB 2.0).

3. Disable your antivirus software—it may be blocking the program's access to ports.

4. Put the router into mode Modem Only in the settings Network Mode.

4. Search and select alternative firmware

If software unlocking doesn't help, a full firmware reflash will be required. The main rule: the firmware must be compatible with hardware revision your router. For example, for Huawei E5577Cs-321 The firmware from: is suitable

• 🌍 HiLink — universal firmware from Huawei for international versions.
• 📡 Rostelecom or Megaphone — often these operators use the same models, but without blocking.
• 🔧 OpenWRT — custom firmware with open source code (not suitable for all models).

Where to look for firmware:

Before downloading, please check:

• 🔍 Does it match? Hardware Version (For example, E5577Cs-321 V2).
• 📋 Is there a note in the firmware description? Unlocked or No SIM-Lock.
• 💬 Reviews from other users (especially on forums).

5. Step-by-step instructions for flashing

Let's consider a universal method of flashing firmware via a web interface (suitable for most models) ZTE And Huawei). For Sercomm L100 or other devices may be required TFTP server or UART programmer.

Step 1: Preparing the Router

1. Connect the router to the PC via cable LAN (not via Wi-Fi!).

2. Go to the web interface at 192.168.1.1 or 192.168.8.1 (For Huawei).

3. Go to the section System → Firmware Upgrade (or similar).

Step 2: Download the firmware

1. Click Choose File and select the downloaded firmware file (usually with the extension .bin or .img).

2. Click Upgrade and wait for the process to complete (the router will reboot automatically).

3. Do not turn off the power during flashing - this will damage the bootloader!

Step 3: Reset settings

After reflashing:

1. Press and hold the button Reset for 10-15 seconds for a complete reset.
2. Connect to the router via Wi-Fi (the network name and password are usually indicated on the sticker).
3. Go to the web interface and configure the Internet connection manually (select the connection type 4G/LTE, please specify your operator's APN).

6. Possible problems and their solutions

Even if you follow the instructions exactly, errors can occur. Let's look at some typical situations:

If the router has become bricked (it doesn't respond to buttons and isn't detected by the PC), there are two options:

1. JTAG programmer — requires soldering skills and specialized equipment.
2. Contacting the service center — some workshops undertake bootloader restoration (cost ~1500–3000 rubles).

⚠️ Attention: If you have flashed the router Sercomm L100 and it stopped turning on, check for a short circuit on the board - this model is sensitive to voltage surges during firmware update.

7. Alternative ways to use a blocked router

If unlocking fails or is too risky, the router can be used for other purposes:

• 🌐 As a Wi-Fi repeater. Connect it to the main router via cable and configure it in mode Bridge or Repeater.
• 🖥️ As a USB modemSome models (for example, Huawei E3372) support the regime Stick Mode — can be connected to a PC and used as a 4G modem.
• 📡 For local networkDisable the SIM card and use it only as a hotspot to connect devices via Wi-Fi or LAN.

For repeater mode:

1. Go to your router settings and find the section Wireless → Repeater.
2. Select the main router network and enter its password.
3. Disable DHCP on the blocked router to avoid IP conflicts.

8. Legality and risks of reflashing

Legally, reflashing a router you own is legal. However, there are some caveats:

• 📜 If the router is rented from MTS (for example, within the framework of the MTS Connect tariff), its modification may be regarded as a violation of the agreement.
• 🔄 Changing your IMEI is prohibited in Russia (Article 13.3 of the Code of Administrative Offenses), but in practice, there are almost no precedents of punishment for unlocking routers.
• 🛡️ The device warranty is void after reflashing.

Technical risks:

• 💥 Loss of working capacity - if the firmware is selected incorrectly.
• 🔌 Power supply problems — some custom firmware increases the load on the power supply.
• 📶 Deterioration of communication — universal firmware may not be optimized for Russian 4G frequencies.

If you are unsure of your abilities, consider alternatives:

• 💰 Official unlock via MTS (cost ~500–1500 rubles, depending on the model).
• 🔄 Buying a used unlocked router (on Avito or Yulia Often they sell devices after unlocking.

FAQ: Frequently asked questions about flashing MTS routers

Question 1: Is it possible to unlock a router? MTS without a computer?

Answer: Yes, for some models (eg. Huawei E5577) there are mobile applications like Huawei HiLink, which allow you to flash the firmware directly from your phone. However, the risk of errors is higher than when flashing via a PC.

Question 2: After updating the firmware, the router doesn't have a 4G network. What should I do?

Answer: Check if the new firmware supports your operator's frequencies. For example, Megaphone In Russia, ranges are used B3 (1800 MHz), B7 (2600 MHz) And B20 (800 MHz)In the router settings, manually specify these bands in the section Network → Band Selection.

Question 3: Where can I get the unlock code for Huawei?

Answer: The code can be calculated by IMEI on websites like huaweicode.com (paid, ~$1–5) or buy on forums. Free generators often provide incorrect codes.

Question 4: Is it possible to return to the standard firmware? MTS after reflashing?

Answer: Yes, if you have the original firmware. Download it from the official website. MTS Or from the 4PDA thread and flash it using the same method. This won't restore your warranty.

Question 5: Why did my internet speed become slower after unblocking?

Answer: Possible reasons:

• Custom firmware is not optimized for your carrier.
• The mode is enabled in the router settings 3G Only.
• The operator limits the speed for "non-native" devices (less often).

Try resetting to factory settings or returning the original firmware.