Hello,

I´m new member here. I have an Axpert MAX 8000 purchased 2 years ago, I want to upgrade the firmware but I don't want to brick the inverter. The attached photos show a label on the side of the inverter, a small label apparently with the date of manufacture, a picture from the Watch Power application, where the current firmware type (72.03) is shown, and a photo of the PCB with the DSP processor. I'm not at all sure if this is a 2809 or 28066 processor.; Please advise me on a working firmware that fixes the MPPT stuck at 90V error in low light (especially in the morning) and the premature float bug. I would be grateful for any information or link to a solution to the problem.

Thanks in advance

Petr

Solved, DSP is 28066, flashed firmware to 272.62, performance in bad weather increased rapidly. Many thanks to the authors of the upgrade.

For other readers, you can usually figure it out from the main (U1) firmware that your inverter came with (in the first post, this is 72.03), and searching the following post for the major version number (in this case 73, the number before the dot) in this post:

What Axpert firmware is that?

To find a patched firmware for your inverter, search the major version number in this companion post. But beware of the overlap of version numbers!

What patched Axpert firmware is that?

Edited November 22, 2025Nov 22 by Coulomb