I have 2 batteries on my ac300. One of them takes firmware updates just fine, the other always says no firmware updates are available even though it’s on an older version.
B1 v1021.11
B2 v1014.16
IOT v9014.12
ARM v4032.11
DSP v4031.30
You have to update each battery individually. So disconnect all the others
Yes, I did that. Otherwise I wouldn’t have been able to update the battery 1.
The issue is that it reports no updates available. It gives a different message if you have both connected.
I suspect that the two batteries come from different production series or were not purchased at the same time. I had the same problem.
Please contact BLUETTI_CARE and ask for customized software.