Deye COMM Error After Firmware Update

Hi all,

I wanted to share our recent experience with a Deye firmware update that went wrong and how Deye support resolved it. Hopefully this helps someone in a similar situation.

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Date: 2026/04/28
Model: Deye SUN-8K-SG01LP1-EU

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🔵 Original Firmware (Before Update)
Protocol Version：V0.2.0.1
Lithium Battery Version Number：V0.0.0.0
HMI：VC.3.4.D
MAIN_1：V3.8.8.1
MAIN_2：V0.7.1.7

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🔴 Failed Firmware Update - Resulted in COMM Error
Protocol Version：V0.2.0.1
Lithium Battery Version Number：V0.0.0.0
MAIN：1400-0017
HMI：0000-C384
LCD Type：0000

What happened: Deye remotely pushed a firmware update from their end. After the update, the inverter displayed a persistent COMM error and would not recover. We followed the standard troubleshooting steps of switching off PV, AC and battery power, waiting 5-10 minutes then restarting but the error would not clear.

We contacted Deye Support at [email protected] with the serial number, firmware details and photos of the LCD screen. They responded promptly and pushed a corrected firmware remotely.

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✅ Latest Firmware - After COMM Error Resolution by Deye Support
Protocol Version：V0.2.0.1
Lithium Battery Version Number：V0.0.0.0
MAIN：6027-1724
HMI：0000-C384
LCD Type：0000

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The inverter is now back to normal operation. Full credit to the Deye support team for resolving this quickly.

If you encounter a similar COMM error after a remote firmware update, my advice is:
1. Don't panic and don't replace the control board just yet. Check the forums first.
2. Contact Deye Support directly at [email protected] with your SN and firmware screenshots.
3. They can push a corrected firmware remotely to resolve the issue.

Hope this helps someone!