How to upgrade the firmware of a Mercury router? The entire series does not automatically upgrade; the official website download should first focus on the hardware version

friend has a Mercury D191G at home that I've used for over two years. Recently, it keeps losing power in the middle of the night, and when WeChat messages are sent in circles, they work fine again during the day. He went into the backend and searched the entire platform, but couldn't find the automatic upgrade switch—not that he was blind, but Mercury's official FAQ was that "our current router series does not support automatic upgrades," . Huawei and Xiaomi's sneaky late-night upgrades are something Mercury users can't envy.

Later, I helped him download new firmware from the official website and manually flash it in. The traffic cut was fixed the same day. This article will clearly explain the complete process and pitfalls of upgrading Mercury firmware, from copying the model to verifying after flashing—just follow it for ten minutes.

first understand one thing: firmware upgrades and hardware versions are two different things

many people mistake "hardware version" for firmware version, this is the first misconception to break down. hardware version is welded shut out of the factory; the sticker says V1 is V1, and you'll never upgrade V2. The firmware (officially called "software") is the part that can be upgraded.

Where can you find these two pieces of information? Two places:

• the router is flipped over, and the bottom sticker shows the model and hardware version. For example, mine is labeled D191G Ver:V4, which is the most reliable.
• finding disassembly troublesome, log in to the backend (melogin.cn or 192.168.0.1; if you can't get in, check can't open that troubleshooting ). The first column, "Running Status," contains the current software version and hardware version

official documentation repeatedly emphasizes one sentence: different models and hardware versions cannot be upgraded to each other; only when the model and hardware version match exactly can the succeed. This isn't just a scare—for the same D191G, the V2 firmware flashed into a V4 machine could at best show a failed verification, or at worst it would be completely bricked. Xiaomi routers have the same generational pitfall. I noted this in my post manually upgrading Xiaomi firmware. My habit is to take a photo of the sticker before downloading and look at both ends facing each other.

here's another official statement: "When the router is working normally, you don't need to upgrade your software." If your machine runs steadily, don't get itchy. Firmware upgrades are always tied to profit and risk.

Where to download

firmware: Download the official website from the download center, just search for the number

Mercury's firmware is only available on the official service support website:service.mercurycom.com.cn, then enter the "Download Center."

here's a trick: just the number in the search box where you enter the model number, . For example, for MW300R, search "300"; for MW316R, search "316". The list will automatically list all models with this number, then click your own one. Instead of just entering full letters, I often can't find it; I got stuck here the first time.

after finding the product, don't rush to click download. The page will list all hardware versions of this model in a row, with V1, V2, and V3 each having their own set of firmware. tap your own hardware version on the sticker. Once inside, the latest version is usually listed at the top. Check the release date and update notes to confirm whether it's a broken stream or a compatibility fix, then click "Download Now."

a word of caution: don't mind the hassle of official websites—just go to Driver Home or ZOL to install firmware. Many of those sites are outdated versions from several years ago. The official statement is: 'To ensure router security, never download or upgrade software through third-party channels.' When it comes to firmware, the official website is the only legitimate way.

downloaded is a compressed file: extract the bin file before speaking

downloaded a zip compressed file. Right-click to extract it to the desktop (if you can't open it, install WinRAR first). After extracting, you'll find a folder with the real firmware file lying inside. The extension is .bin. Remember where you put this folder and use it next.

here's a tip: if your home is an old Mercury from over ten years ago, and you don't see any 'Browse' or 'Select' buttons on the upgrade page, it goes TFTP upgrade —there's a tftp32.exe in the extracted folder, double-click to run it, refresh the router's backend page, and click the upgrade button. New machines (bought in recent years) are uploaded via web and don't encounter this outdated process.

Six steps to local upgrade: Wired connection, no power outage, 2-3 minutes for the whole process

this step is simple. This is how I flashed my friend's D191G:

• the computer plugged into the router's LAN port with a network cable (the official recommendation does not recommend wireless upgrades, as a single chain drop can be troublesome). Open melogin.cn
• browser to access the backend. If the domain cannot be opened, change the management IP. If that doesn't work, check the troubleshooting article on melogin.cn
• left menu" System Tools" → "Software Upgrade"
• click "Browse" (some firmware uses "Select"), find the folder you just extracted, select the bin file
• click "Upgrade", click "Confirm" in the pop-up window
• wait 2-3 minutes, then the router will restart automatically. Don't move anything until the progress is complete

throughout the entire upgrade process, the router must never be powered off. The official statement is "Otherwise, the router will be damaged," . This is no exaggeration—if the power goes out halfway while writing firmware, the machine gets stuck in a half-brick state. So choose a time when the power supply is stable. Laptops come with built-in batteries, which naturally suit them, while desktops avoid the old problems of thunderstorms and home trips.

after rebooting and logging back into the background, the "Running Status" section shows the version number on the official website, and that's it. Let's also check if the WiFi name password and broadband dial-up are all there, which leads to the next topic.

Will the specs be lost after

upgrade? Even the official team is stuck on both sides

this is interesting. The official document states at the beginning that "under normal circumstances, the router's original configuration will be lost after upgrading. You need to import the configuration file or manually reconfigure it," and the FAQ also says, "Generally, after software upgrade, the router's configuration will not be lost and can be used directly." The same official website can be said in two sentences.

my own test: the D191G was upgraded from the V4 firmware to the new version of the month. The WiFi name, password, and broadband account were all there, and after rebooting, it worked immediately. But to be safe, you export a copy of the configuration file from "System Tools → Backup Configuration" before upgrading. The official recommendation is the same: if you lose the configuration, just import it and it's back. It takes five minutes, which is better than dialing up and setting up WiFi again.

two fun facts: after upgrading, even if you reset by pressing reset, you only clear the configuration and won't revert to the old firmware . If you want to downgrade, you have to manually check the official website for the past version; Additionally, the official statement clearly states that "unless there are special circumstances, it is not recommended to revert to old software." Downgrading is more likely to cause trouble than upgrading, so don't keep going back and forth.

is it worth upgrading under certain circumstances, and what if you really get farmed like bricks

first give a criterion: don't get itchy just because you see new firmware:

as for the debate over whether to enable auto-upgrade, Mercury users can simply skip it—there's simply no switch for that. How to choose other brands? In the article on whether to enable automatic firmware upgrades , I divided the machine into three categories in detail.

you really brick it (power interruption after upgrade, wrong hardware version), don't try brick-saving tools online. Mercury's after-sales hotline is 400-8810-500. During the warranty period, non-manual bricking is the easiest way to replace the product with after-sales service. My old MW300R failed to upgrade back then and the lights went out. I called and arranged for a replacement the next day.

Here's the complete sequence: copy the sticker model and hardware version → search for the number in the official download center → Align with the hardware version under zip → extract bin → backup configuration → wired upload → Wait 3 minutes without power-off → Check the version number in the running mode. After completing the eight steps, a Mercury is considered well served.