Firmware Updates - EG4 Community Forum

Quietly posting Firmware Update - WHY?

PowerUp — Sat, 04 Apr 2026 23:18:54 +0000

Once again a NEW firmware EG4_FAAB-2727 was posted (for Flexboss / 12kPV / 18kPV).

WHY does this forum exist?
Why do we have to randomly check?
Why is there very little detail to understand if this addresses previous issues?
Who should consider skipping this release?

Firmware is important! Without it these inverters would just be noisy wall heaters.

I implore EG4 to treat software as its own product. It is our OS.

Please don't bother if you are just going to return to this post and say Whoops AGAIN.

I'm hoping there is impactful information beyond the bulleted list that can be offered.

EG4_FAAB-2727

2026-03-29 <=== Its only been a week

Based on FAAB-2626/2525.
Match LCD V25.
1. Improved. New England Grid Profile — added regional grid profile support for New England configurations, with Voltage-Active mode disabled by default.
2. Improved. Added RS485 BUS communication support on the Meter485 port for PPL Electric installations.
3. Improved. LUMA Grid Profile: Voltage-Active Power mode enabled by default.
4. Improved. HECO Grid Profile: Frequency-Active Power mode enabled by default; under-excited reactive power set as default.
5. Improved. Optimized charging power limitations when PV power is unbalanced across inverters in a parallel system.
6. Improved. LCD phase setting labels updated from R/S/T to A/B, B/C, C/A （LCD V25）.
7. Improved. Update fan logic to start fans at a lower temperature to optimize heat dissipation.
8. Bug Fixes. Fixed repeated switching between on-grid and off-grid modes on the secondary inverter triggered by off-grid cut-off voltage in parallel shared-battery and lead-acid battery mode.
9. Bug Fixes. Reduced probability of repeated state switching between PVBatGridOn and PVChgGridOn.
10. Bug Fixes. Fixed the inability to exit on-grid AC couple charging state and switch to battery discharge when load exceeds AC couple power in a parallel system.

performing firmware on remote systems

epenzenstadler — Tue, 20 Jan 2026 16:13:10 +0000

I have a system that I would like to perform a firmware update on the gridboss and flexboss21. The IT infrastructure does not have backup power, meaning if the inverter or gridboss turns off it's output during the update I will lose connectivity. Will this be a problem? Will I need to connect a UPS to the modem, router, bridge, and access point while performing the update?.

314 Ah Indoor Battery Firmware Update?

cptmorgemaker — Thu, 15 Jan 2026 14:02:38 +0000

I just installed two of these with my existing flex boss 21 and grid boss and 3-280 amp hour indoor batteries. Communication was not working properly and a firmware update had to be pushed by eg4. I don't know if you guys have anything to say on that or if you're going to update the firmwares in-house or put them out there so people can update the batteries themselves so they don't run into the same issue as I did.

Ryan

New 6000XP Firimware-1C1212

EG4 Eric — Tue, 18 Nov 2025 15:43:37 +0000

There is a new firmware update available for the 6000XP (EG4_cca-1C1212). If you have any questions about the update or need assistance installing it on your inverter, please let me know.

Thank you!

2004

FAAB-2525

redpineapple — Mon, 20 Oct 2025 20:01:21 +0000

Any reason why EG4 refuses to post details on the new 2525 firmware on their official forums?

FAAB-2122 - also ethernet dongle issues

jaredmauch — Tue, 01 Jul 2025 15:08:12 +0000

Has anyone else experienced issues with the ethernet dongle not reconnecting with the inverter after a config change or device change such as the firmware update? I just installed FAAB-2122 and while the device still talks on RS485 just fine, the ethernet dongle and export to the fixed IP on the ethernet dongle isn't working. It's left with just the 2nd LED on vs all 4.

I don't want to have to physically reconnect the ethernet dongle each time, and the wiz-7500 that it's based on also has a lot fewer features than the wifi dongle, but also seems to just not work correctly, hence me using the rs485 for reliable data in/out of the inverters.

I have several inverters 12kpv and 18kpv and they all exhibit the same behavior. Any chance we can also get the release notes for this firmware as well?

Flexboss LCD Screen Firmware Update

vsuresh — Fri, 04 Apr 2025 21:57:41 +0000

The Flexboss LCD Display manual shows the steps to update the display firmware. Where can I find Flexboss LCD Screen Firmware?

Thanks,

Suresh

12Kpv Firmware Update issue

PonoBill — Tue, 11 Mar 2025 18:04:39 +0000

I attempted to update the firmware on a new 12KPV last night and noticed the choices to upload firmware when in local connect are 18Kpv-12kLV or 12000XP only. So instead I did the firmware update with a USB thumb drive (had to buy a 16GB drive, fortunately Office Depot still has some, and unearth an old windows laptop). After the update the firmware version is unchanged EAAB-1B1B. Is this the latest for the 12Kpv? The software glitch I was trying to resolve still remains. I'll ask that question elsewhere. For now my questions are is EAAB-1B1B the latest version for the 12Kpv and is one of the two available online updates that refer (sort of) to the 12Kpv the correct one? and if so, which?