Unexpected and unrequested firmware update 2 March 2026

[UK_KH_User123]

Hello!

After losing power to my house (because it runs off the EPS output of my KH10.5) I discovered the inverter just had an update pushed to it which I did not request from my installer, nor from Fox, nor from the app itself (which only a week ago appeared the option to request an update manually).

It pushed me thusly:

Went from Manager 1.37 to 1.58
Went from Master 1.41 to 1.60
'Slave' unchanged at 1.01

This has never happned to me before (2.5 years on). I previously have emailed Fox UK support and requested an update.

Anyone else had this experience?

Is it correct 'slave' still sits at v 1.01?

I have a call in to my installer to see if he pushed it. Thanks for any insights!

[MaterialBarracuda48]

Check the same question I asked about the Slave.
Dave replies 1 post below.
viewtopic.php?p=12031#p12031

[UK_KH_User123]

Thanks for the link.

The strange thing is, after writing that, I noticed that the app update area shows that one "upgrade" is available and that is to take 'slave' from 1.01 to 1.02.

I haven't pushed that 'Upgrade Now' button yet but it is tempting so at least all three are up-to-date.

[UK_KH_User123]

Oh, now I see that my data logger (W4 type) has an update available from 4.12 to 4.14. "Upgrade Now"???

<edit> I did it. Was quick and seems to still be working.

[UK_KH_User123]

Check the same question I asked about the Slave.
Dave replies 1 post below.
viewtopic.php?p=12031#p12031

Are you on 'slave' 1.02 with your KH? I may push the button so at least I'm in control of the timing.

[MaterialBarracuda48]

Are you on 'slave' 1.02 with your KH? I may push the button so at least I'm in control of the timing.

Yes I am on v1.02

[UK_KH_User123]

Cool, thanks! ... I figured since 1.02 is the listed current version and it was offered I should keep the versions in-sync with each other. So I pressed the update button in the app and it successfully updated. That update did not cause a full inverter reboot so it didn't cause problems. I'm not sure if it's the manager or the master that causes the full reboot which kills the EPS output.

[MaterialBarracuda48]

Makes sense that you are now up to date, at least mine has carried on working.

[UK_KH_User123]

I contacted my installer who said he did not push the update. So I guess FoxESS has started doing this themselves.

Since I run local control with Modbus and I don't need the Fox Cloud, I have decided to block that communication at my router. Easier than unplugging the datalogger but with similar results.

If there’s an update that I should get I can unblock it and request it from the app (or from my installer or FoxESS UK support).

I feel safer this way, from hacking (it is certainly possible) or malicious actions from inside FoxESS (who could be compelled by the CCP in a time of war, or any time they feel lke it, though obviously it would hurt their industrial exports), and also from the comparatively minor issue of a pushed update with no warning which powers down my house when the inverter reboots. Note - that happens to me because I run the house off of EPS. I think people who run the ’normal way’ would not notice the reboot.

[Dave Foster]

It happened to me the other day as well, like you I lost my EPS when the Master updated as it reboots the inverter - I am the user, installer and agent for my system so it could only have been Fox. I suspect because of all the issues with the latest app update and the scheduler incompatibilities with different inverters/firmware combinations, Fox are in the process of force pushing their latest firmware out to all users (whether you want it or not).
Definitely a warning for EPS users, I nearly pulled my datalogger out so it cannot happen again… still dwelling on that.

[MaterialBarracuda48]

Rather interesting if Fox pushed this through. I wonder if others will have the same treatment of pro-active rollout.

[UK_KH_User123]

It happened to me the other day as well, like you I lost my EPS when the Master updated as it reboots the inverter - I am the user, installer and agent for my system so it could only have been Fox. I suspect because of all the issues with the latest app update and the scheduler incompatibilities with different inverters/firmware combinations, Fox are in the process of force pushing their latest firmware out to all users (whether you want it or not).
Definitely a warning for EPS users, I nearly pulled my datalogger out so it cannot happen again… still dwelling on that.

Probably ... supporting a wide range of installed versions would be tough. Maybe it will end up as a benefit in the long run.

[MaterialBarracuda48]

I see Dave posted up the same thing as you, well at least you confirmed it had to have been Fox doing it pro-actively.

I guess there was nothing on their website to suggest they are going to be rolling out updates? They seem to know how to piss off their users

[evilbunny]

Definitely a warning for EPS users, I nearly pulled my datalogger out so it cannot happen again… still dwelling on that.

We had a long wait between ordering an install and actually getting the install done due to a long list of things like grid approval, storms likely on install dates and so on.

I ended up upgrading 2 old UPSes with dead LABs in them to have 2x50Ah LFPs because the UPSes are 24v, due to different charging voltages the batteries only charge up to about 80%, so pros and cons.

So while we're on the EPS circuit for the light circuit and power point circuit, only appliances and lights would go out. but we'd suddenly import from the grid too, which would be a pain at the wrong time.

[Dave Foster]

Definitely a warning for EPS users, I nearly pulled my datalogger out so it cannot happen again… still dwelling on that.

We had a long wait between ordering an install and actually getting the install done due to a long list of things like grid approval, storms likely on install dates and so on.

I ended up upgrading 2 old UPSes with dead LABs in them to have 2x50Ah LFPs because the UPSes are 24v, due to different charging voltages the batteries only charge up to about 80%, so pros and cons.

So while we're on the EPS circuit for the light circuit and power point circuit, only appliances and lights would go out. but we'd suddenly import from the grid too, which would be a pain at the wrong time.

Thanks, I used to have a small UPS but the EPS has been very effective and ditched it a couple of years back when the lead acid’s needed replacing, but to protect the essential stuff when the inverter is rebooting I think it’s time to re-look at a small LFP powered UPS.

[evilbunny]

Thanks, I used to have a small UPS but the EPS has been very effective and ditched it a couple of years back when the lead acid’s needed replacing, but to protect the essential stuff when the inverter is rebooting I think it’s time to re-look at a small LFP powered UPS.

This came up the other day elsewhere https://au.ecoflow.com and they make LFP UPS

[UK_KH_User123]

I just ordered one of these: https://uk.ecoflow.com/products/river-3 ... 2824856915

Claim to have switchover speed comparable with a UPS -- and cheaper than similar capacity ups -- and the batteries should last longer due to being LiFePO4.

[MaterialBarracuda48]

I grabbed a Bluetti AC180 for my UPS needs, I can confirm it works during a power outage.
https://bluettipower.co.uk/products/blu ... er-station


That looks good for the price per kWh

I just ordered one of these: https://uk.ecoflow.com/products/river-3 ... 2824856915

Claim to have switchover speed comparable with a UPS -- and cheaper than similar capacity ups -- and the batteries should last longer due to being LiFePO4.