Should the firmware update for smart devices be updated immediately? The vacuum cleaner threw a map and set rules for three types of equipment

one morning last month, the vacuum ran in the living room for two hours without recharging. When I opened the app, it showed that the firmware had been updated automatically at midnight, and I also updated the map.

the restricted zone around the cat food tray, the virtual wall next to the charging dock, and the cleaning plan to avoid the child's nap time — all gone. It swept over the cat food bowl, and the cat bristled its fur and leapt onto the sofa. We ran through the entire house drawing again, then redrew the restricted areas one by one, which took more than an hour.

I can't figure it out: even when the internet is offline, the map doesn't get lost, but a firmware update actually loses it. Later, I realized that most updates come with storage adjustments, and once the map format changes, old maps become unrecognizable. Since then, I've set a rule for updating firmware for dozens of smart devices at home—not a one-size-fits-all shutdown, nor a mindless one-stop setup, but three tiers based on the device, each at a different timing.

first think about it: if a smart device update fails, the cost is on a whole different scale than a router.

firmware update fails, at worst, you can restart the router, restore the configuration, and it just stays stuck in the flash storage. the router article I wrote about how to weigh this. Smart devices are different. When they fail to update, the app goes offline and won't wake up; Even worse, the yellow light stays on all the time, turning it into bricks.

someone's Xiaomi camera upgrade got stuck in the 'Upgrading Process' issue, and the yellow light stayed on. The only option was to format the SD card to FAT32 and copy the firmware recovery to restore the card to recover it. There are also cases on complaint platforms where the upgrade to brick was denied coverage—the manufacturer deemed the upgrade to lose power and considered it a usage issue. The developer guidelines for Xiaomi's IoT platform clearly state: firmware for devices like cameras must undergo double backups via OTA; if there is a silent update, the battery will fail, and after restarting, it must be able to update again. Standards are rules, but older models don't always follow the rules, so you have to control the timing and conditions yourself.

there's another layer: updating smart devices doesn't mean they're done. Network information, automated binding, map data—if any one is reset, whole-house linkage will be disconnected. This is where it is more troublesome than a router, and it's also the starting point for my three-tier setup—ultimately, the three-tier rule is all about the timing when you can afford to pay if you fail.

to tell if you should click this update immediately, here's a simple method: if the update notes say "fix" or "optimize stability," especially if you specifically fix offline, disconnection, or abnormalities, just close your eyes; The 'New' and 'Supported' sections are feature updates, so it's worth slowing down—it's safer to wait for others to fall into a couple of pitfalls.

Cameras: I never dare to delay security patches

The cameras at home are the ones most heavily watched by the black market. Last year, I checked every six heads in my home one by one. weak passwords, bare ports, ununbound second-hand devices—every one was full of holes. And all these patches are just buried in firmware updates—vendors fix the backdraft when they discover vulnerabilities, and without using firmware, there's no other way in.

I have an old camera at home that an elder gave me, and I haven't updated the firmware for three years. The night I checked its backend, I found out the version was stuck in 2022, and none of the bugs the official patched later were touched. I later decided on how to handle this kind of equipment: if it can be updated, then redo it; If updates really stop, just follow the path of old camera to take it down from the cloud, plug it into the IoT private network, and don't give it a chance to touch the external network.

camera update, I have three fixed conditions: stable power supply (confirm the plug-in model has no false socket), good signal (the worst if the update package drops halfway), and someone at home. All three are met. As soon as the prompt pops, I click and never leave it overnight. Another battery option: battery is more than half full. The unit at my doorstep was already on a three-week charge schedule, but when the battery dropped to 20% and then refreshed, I charged first and then restarted, not rushing that night.

speakers and gateways—the 'brains': pick your bedtime updates, don't run into the peak linkage

the Xiaoai speaker at home Pro multi-mode gateway the brains of dozens of devices. Bluetooth sub-devices and more than twenty Zigbee sensors rely on them to communicate with the phone.

features of these two updates: the process must be restarted, and during those few minutes of reboot, all subdevices under their names go completely unconnected. On the night my multi-mode gateway was updated, the human body sensor, door and window sensor, and temperature and humidity meter all covered the app with dust, looking like something big had happened. A few minutes later, they all came back on their own.

so for brain devices, I only pick two times: before bed (automation is done, a few minutes off doesn't matter), or before the whole family leaves (no one uses it anyway). The biggest fear is running into the peak of the homecoming mode linkage—unlocking the door triggers the lights and air conditioning, but your mind is rebooting, and the whole link goes silent.

there's another counterintuitive point: brain devices should be updated frequently. Most fixes for issues like sensor disconnections or slow device response are mostly handled by firmware updates. Afraid of losing contact, she didn't update for years, which was like stopping the medication.

battery devices: If the battery is insufficient, absolutely do not

doorbells, door locks, thermometers and hygrometers, wireless switches, and other devices that rely on button or lithium batteries. Check the battery level before updating. Forcing firmware at low battery and running out of battery halfway through writing is a classic path to bricking.

my line is fifty percent. The doorbell has a large 5200mAh battery, so if it drops below half, just charge it first; For thermo-hygrometers powered by the CR2450 button, if the voltage drops below 2.7V, replace the battery first— just a multimeter to measure takes about ten seconds. Also, the battery device's firmware is sent via Bluetooth or via gateway push. When updating, people should get closer and don't let it struggle through two walls.

the master switch—should it be turned off or not

In the Mijia app, there's a master switch: My → More Settings → Check for Updates, and there's 'Firmware Auto-Update' inside. Whether it's fully automatic or fully manual is a dilemma for many people.

my compromise: the master switch is on, but two safety barriers are added. One is to check the device list in the morning: if everything is green, it's done; if there's dust, deal with it on the spot—automatic push notifications mostly happen at night, and if something happens, it happens at night, and if you find out in the morning, it's still in time. Another approach is to leave some redundancy when building scenes: important linkages don't just hang one device, the home-mode setup even if my speakers are down, there's a wireless switch to support it, so updates don't mess up the whole house.

a robot vacuum with a map, I'll treat it separately: save a screenshot of the forbidden zone in your album before updating. If you really lose the map, just redraw it from the screenshots—ten minutes is much more reliable than drawing from memory.

By the way, this switch isn't exclusive to Mijia. Every smart home app has its own settings, and after flipping through them, it's just two places: the dots at the top right of the device detail page, or the settings page under 'My.' There are various terms: some call it firmware upgrade, some call it system upgrade. Just focus on the words "firmware" and "upgrade"—don't expect every app to put it openly.

one check before and one after the update, a fixed routine

the three things to check before the update: check the battery level, check the signal, and check if anyone is home. After the update, check the device list in three ways: check device list all green, check automation once (kick the door sensor to trigger the night light for the most hassle-free), check physical buttons and still press them. The third check was taught by my family's feeder—once, after an update, the app was completely green, but the manual feed button on the device didn't work. No matter how I pressed it, it didn't respond. I had to pair it again before it was saved. So don't just trust the app—press the button on the device too.

The sequence follows one main thread: cameras first, then brain-related devices, vacuum cleaners follow, battery devices come later. If the update fails and you go offline, first disconnect the power and try restarting, then pair it again. If neither end can be saved, then contact after-sales service. Don't disassemble it yourself.