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This incident has been resolved.
All 21.1 and 20.4 images have now been updated on the software center for download to resolve this upgrade issue. For more information and recommendations, please see the service bulletin issued here:
https://www.calix.com/bin/calix/servlets/docdownload?fileId=/content/dam/calix/doc-library/systems/prem/bulletins/cab/cab-21-031/CAB-21-031_exos-image-certificate.pdf
Calix has updated the 21.1 images for u6, u4, u4m and GP1100x on the portal and are now available for download.
Calix EXOS development is investigating reports of issues with firmware updates of GigaSpire u4 and u6 systems. Calix Cloud is functioning normally.
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