Hello everyone,

A friend failed to flash the firmware for his Axpert King 2 inverter control panel. I've searched, but I can't find any firmware. Could someone help me?

Thanks.

On 2025/04/05 at 8:41 AM, Cookies971 said:

failed to flash the firmware for his Axpert King 2 inverter control panel.

Do you mean failed to find a suitable firmware update file, or used the wrong one and apparently bricked it?

On 2025/04/05 at 8:41 AM, Cookies971 said:

Could someone help me?

[ Edit: I don't know where got the below idea from. King II display firmware seems to vary a lot. Best to keep to the same major version number (the first two digits) as what you have now. ]

It's the same display firmware as older VM IIIs and King 1s, the 02.xx series. The latest I know of is available here; ignore the 72.05 King 1 main firmware:

Edited September 25, 2025Sep 25 by Coulomb

@Coulomb ,Could you share the latest firmware for the King II? I'd appreciate it! I'm trying to communicate with an EG4 Lifepower4 lithium battery, but the current firmware doesn't have options for lithium battery protocols. I even saw on the EG4 website that in the Voltronic inverters they sell as 6kW 140V, in the configuration menu, when selecting the battery, an EG4 option appears, which already communicates directly with these batteries of the same brand. But I haven't found anything similar for the King II. Could you share a firmware that allows the King II to communicate with lithium batteries?

My current firmware versions are:

U1: 51. 01

U2: 13. 20

U3: 00. 24

Edited August 31, 2025Aug 31 by Magoiot

On 2025/08/31 at 6:37 AM, Magoiot said:

@Coulomb ,Could you share the latest firmware for the King II? ...

My current firmware versions are:

U1: 51. 01

U2: 13. 20

King II firmwares are very confusing. My collection of King II main (U1) firmwares are only 50.xx and 70.xx. I have various display firmwares that are supposedly for King IIs, including one that seems to report as 51.02!

So until I get some clarity, I can't make suggestions for what to update to. Sorry!

Also sorry for the late response.