EG4 18KPV stuck on firmware fAAB-CC1C

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It was able to update with no issues. The current firmware is fAAB-1E1E. Three of my units have a capital F and three have a lower case f. Does the lower case indicate an older model of inverter? The 3 with the lower case f have lower serial numbers than the 3 with the upper. Thank you.

That happens sometimes, but the firmware versions are the same and will not impact performance.