Hello friends, I need your help

I have a GSB Max 8kw inverter with

SN: 96342206107591

Program version

V1: 72.03

V2: 112.15

It stops and gives me F90 error, after searching and contacting with some providers I know the inverter needs to update its firmware but it is not available

Please help me to fix this problem, I need suitable firmware and how to update

by the micro USB port using flash with OTG

On 2025/05/13 at 6:26 AM, bashaar basheer1 said:

It stops and gives me F90 error, after searching and contacting with some providers I know the inverter needs to update its firmware but it is not available

You are very lucky that Voltronic seem to have given up on fault code 90; maybe it caused too many issues and few clones are being caught with it. This one being an exception.

Just update to the latest firmware (72.08), or the latest experimental software with the presumed good MPPT logic (72.75), but NOT to firmware version 72.66 or patched firmware based on it, such as patched firmware version 272.66.

All these are available in the post below, as is the link to the upload instructions, explaining the two options (RS-232 versus OTG cable).

Edited May 14, 20251 yr by Coulomb