AC200MAX nach ARM Update, Fehler 026

gestern gab es ein Firmwareupdate für die AC200MAX EU 230V (ARM update).
Alt ARM 4008.0, Neu 4008.6
Ich hatte mit diesem Update die Hoffnung,
dass endlich mal das asynchrone laden und entladen der beiden B230 behoben ist.
Hat alles so weit funktioniert, nur seitdem zeigt meine AC200MAX den Fehler 026 (Akku Unterspannung) an.
Die Box ist fast vollgeladen 97%.

Die DC und AC Ausgänge (ohne Last) kann man zwar einschalten, schalten aber ein paar Sekunden später wieder aus.
Auch eine Verbindung über Bluetooth ist nicht mehr möglich.
Das Laden funktioniert ebenfalls nicht mehr richtig, wird mit dem Netzteil geladen,
wird das Laden immer nach ein paar Sekunden unterbrochen, und neu gestartet.
Teilweise reagiert die Box auch sehr träge auf die Bedienbehelfe.
@Bluetti das war wohl nichts mit dem Update, vielen Dank auch…
yesterday there was a firmware update for the AC200MAX EU 230V (ARM update).
Old ARM 4008.0, Neu 4008.6
With this update I had the hope that finally the asynchronous loading and unloading of the two B230 is fixed.
Has everything worked so far, only since then my AC200MAX shows the error 026 (battery undervoltage).
The box is almost fully charged 97%.

The DC and AC outputs (without load) can be switched on, but they switch off again a few seconds later.
Connecting via Bluetooth is also no longer possible.
Charging also no longer works properly, is charged with the AC adapter,
the charging is always interrupted after a few seconds and restarted.
Sometimes the box also reacts very sluggishly to the operating aids.
@Bluetti that was probably nothing with the update, thanks also …

Hi @jockel66 , could you please share us your SN code of AC200MAX?
I would have an engineer push a BMS firmware update to you again. Try to see if it still happens after the update

this will not work, there is no Bluetooth connection possible anymore.

The box now goes to Poweroak, repair or exchange.
This was then my last update, this does not work reliably

You need to connect Bluetooth and the phone should also open Bluetooth and positioning, could you please try again?

A Bluetooth connection after the update is no longer possible,
only the serial number is displayed.



See your here, the same problem after update. :face_with_symbols_over_mouth:



I am having the same problems after the update with my EU AC200Max… i wish i had read this sooner :grimacing:

more and more people are coming forward,
and from bluetti no position name to the update problem.

1 Like

Please @BLUETTI , My box is useless now and i get no answers anywhere. Not in forums or on my app. I posted or tried to post a warning in the Bluetti EU group but even that post is under review already for 24 hours and it is not released!!! At least warn people about this issue as much as you can because that will benefit your organisation also. Every saved battery is one you do not have to replace…

Have last week also already informed and about the problem - defect, with a request for repair or exchange. So far no response received.
The seller has worked for the exchange. I still have not received a response from Bluetti

Hallo, ich habe dasselbe Fehlerbild nach einspielen des Updates

Bluetti Support stellt sich tot, unterirdisch .-8

ich habe exakt die gleichen Probleme nach dem Update.

Meine AC200MAX ist jetzt wenigstens unterwegs zum Verkäufer,
ich hoffe, dass die dann repariert oder umgetauscht wird.
Jedenfalls war das dann das letzte Update, das ich an den Bluetti´s durchführe.
Ja, und Bluetti stellt sich tot

They finally found the problem. Any upgrade done with not the 1.3.3 version of the app will result in our unfortunate situation. So guess what is the advise? Download the 1.3.5 version and upgrade again from there. BUT STILL WE CANNOT MAKE A BLUETOOTH CONNECTION WITH THE MAX AND IT DOES NOT HAVE WIFI.So there… It doesn’t fix nothing and i am forced to use the terribly terribly bad visual app from now on… And i thought it could not get worse…

Ja, ist so Bluetooth funktioniert nicht mehr, so ist auch kein update an der AC200MAX mit der App möglich. Bleibt noch eine Reparatur im Werk oder Umtausch übrig.
Yes, so Bluetooth no longer works, so no update is possible on the AC200MAX with the app. Remains a repair in the factory or exchange.

After the update update no further Communication via bluetooth is possible; so @BLUETTI replace all power boxes of users affected, last call for you. Next will be from my laywer to take back whole system back and refund it (AC200Max and 3 x B230)

We are very sorry for the inconvenience. We have confirmed with the relevant technical engineering that if the AC200MAX does not continue to work after updating the firmware, it will need to be returned for repair and a single update process at a service station.

Yesterday I received my box back repaired.
But that is handled through the Amazon store.
From Bluetti customer service
( and
I have not received an answer until today.
About answer within 48 hours…

Shocking service. How can you push out an update without testing that bricks machines. At least send everyone an email telling them not to update and that their is an issue.