Updating router firmware safely

Troubleshooting · Published October 16, 2026 · Last updated October 16, 2026

Firmware is the software that runs your router itself — the operating system underneath the Wi-Fi name and password you set. It is also the one update most homes never install. That matters for two reasons. First, security: the US Cybersecurity and Infrastructure Security Agency (CISA) notes that firmware updates “enhance product performance, fix flaws, and address security vulnerabilities.” An unpatched router is the front door of the whole home network left on an old lock. Second, stability: a share of the random reboots, dropped connections, and features that quietly stop working trace back to bugs the manufacturer has already fixed in a newer release.

The update itself is not hard. What makes people nervous — reasonably — is the warning that interrupting it can damage the router. That risk is real but narrow, and it is almost entirely controlled by preparation. This guide is built around that idea: a short safety checklist first, a simple framework for choosing how to update, numbered steps with the real menu paths for two major brands, and a verification check at the end so you know the update actually took.

Before you touch anything: the safety checklist

Do these four things before starting any update, whichever brand you own. Together they remove nearly every way a routine update goes wrong.

1. Write down the exact model and hardware version. Both are printed on the label on the bottom or back of the router — TP-Link, for example, prints a string like “Ver: 1.0,” and the same information appears in the admin page. TP-Link's official guidance is blunt about why: check the hardware version before downloading anything, because using the wrong firmware file can damage the device and void the warranty. Same model name, different hardware version, different file.
2. Download only from the manufacturer, and match your region. Firmware comes from the maker's official support site for your exact model — never from a driver-download site or a forum link. TP-Link additionally warns that firmware differs by purchase region: EU and US files are not interchangeable, and the file should come from the local official site for where the router was bought.
3. Back up your current settings. Most updates keep your configuration, but some release notes say the update will reset the router to factory defaults — and then your Wi-Fi name, password, port rules, and everything else are gone. A backup turns that from a disaster into a five-minute restore. On TP-Link routers the backup lives at Advanced > System > Backup & Restore: click BACK UP and save the file (it is named config.bin by default). Other brands place an equivalent Backup or Save option in their Administration or System section. If your router has no backup option, at minimum write down the settings you changed from the defaults.
4. Pick a quiet time and a wired connection where you can. The update reboots the router, so the whole house goes offline for a few minutes — do it when nobody is mid-call or mid-movie. TP-Link advises against updating over a wireless connection unless the device has no Ethernet port, and suggests stopping internet applications on the computer first. A laptop plugged into a LAN port removes one whole failure mode.

Auto update or manual file: which route for your router

There are three ways firmware gets installed, and the right one depends on what your router offers. This decision framework keeps it simple:

One special case: if the router came from your internet provider, the update may not be yours to run at all. The US Federal Trade Commission (FTC) advises checking with the provider whether it pushes automatic updates to its routers. If it does, your job shrinks to confirming the version is current. The FTC also suggests registering the router with the manufacturer and signing up for update notices, so the next release finds you instead of the other way around.

The update, step by step

The steps below follow the manual and one-click routes, with the exact menu paths for TP-Link and ASUS — the pattern on other brands is the same shape with different labels.

1. Connect and log in to the admin page. On TP-Link, open a browser and go to tplinkwifi.net, then sign in. On ASUS, go to your router's LAN IP address or asusrouter.com and click Sign In. Use a computer connected by cable if you can.
2. Note the current firmware version. It is shown on the firmware page itself (and on TP-Link models at the bottom of the admin interface, next to the hardware version). Write it down — the success check at the end compares against this number.
3. For a manual update, download and prepare the file. Find your exact model and hardware version on the manufacturer's support site, download the newest firmware for it, and unzip the download. The file you will upload is usually a BIN file.
4. Open the firmware page. TP-Link: Advanced > System > Firmware Upgrade, then click BROWSE and select the extracted file. ASUS manual route: Administration (under Advanced Settings) > Firmware Upgrade > Upload, then choose the file. For the one-click route instead, click the router's own Check or Update control and let it fetch the release itself — on ASUS a pop-up appears at the upper right when a new version is available, and Update now leads to the Firmware Upgrade page.
5. Start the update and then do nothing. Confirm the prompt (TP-Link's says Upgrade). From this moment the rule from both manufacturers is identical: do not turn off the power, do not unplug the Ethernet cable, and do not disconnect, until the process finishes. An interrupted flash is the one genuinely dangerous moment in this whole procedure.
6. Let the router reboot itself. TP-Link puts the wait at about 3 minutes; ASUS says to wait a few minutes for the upload and restart to complete. The Wi-Fi name disappearing and reappearing is normal.
7. Log back in and verify. Return to the same firmware page and confirm the version shown is the new one — TP-Link's page reports the updated version there directly. Reconnect your devices and open a few sites and apps to confirm the network behaves normally.
8. Turn on automatic updates if the option exists, set for an unused hour, so this is the last manual update you ever run. Then log out of the admin account — a step the FTC specifically recommends after any settings session.

What success looks like: the firmware page shows the new version number (different from the one you wrote down in step 2), every device reconnects to the same Wi-Fi name without re-entering passwords, and a quick speed test beside the router lands in its usual range. If the release notes warned of a settings reset and your network came back under a default name instead, that is the expected case, not a failure — restore the backup file from the same Backup & Restore area, or run the setup wizard again.

If the update fails or the router misbehaves afterwards

Stay calm and work in this order. First, give it time: a router mid-reboot can look dead for several minutes, and pulling the plug during that window is how a recoverable situation becomes a real one. Second, if the admin page will not load after a generous wait, power the router off and on once, wait again, and try the admin address once more. Third, if the router responds but settings are scrambled or the update plainly did not finish, ASUS's official path is to restore the router and upgrade again; if a normal retry still fails, ASUS provides a Firmware Restoration utility used in Rescue Mode to upload firmware to an uncooperative router. ASUS also recommends restoring factory defaults after an update as a general practice — Administration > Restore/Save/Upload Setting > Factory default > Restore — followed by running the setup wizard again, which is another reason the step-one backup matters. Finally, the honest endpoint: a router old enough that the manufacturer publishes no firmware for it anymore is not protected by any procedure. At that point the update problem has become a replacement question, and no setting changes that.

FAQ

How often should firmware be updated? Whenever the manufacturer releases a version for your model — there is no fixed calendar. Automatic updates, where available, remove the need to think about it; the FTC's suggestion of registering the router for update notices covers the brands that do not push them.

Will updating erase my Wi-Fi name and password? Usually not — but some releases do reset settings, and the release notes or the router's app will say so (TP-Link's Tether app flags exactly this in its release logs). That is why the backup comes before the update, not after a problem.

Can a phone do the update? On routers with a companion app, yes: TP-Link cloud routers update through the Tether app, and ASUS recommends its router app as a firmware route. The same rules apply — stable connection, quiet time, and do not interrupt the process.

Is it safe to skip updates if everything works? Working and patched are different things. Per CISA, updates address security vulnerabilities as well as performance and bugs, and the vulnerable ones are invisible in daily use. A router that works fine can still be the weakest door in the house.

Related: Fixing Wi-Fi that keeps disconnecting →