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Firmware 2.3 is not compatible with iO-CU 3.0, 3.1, 3.2, 3.31, 3.32, or 3.4. If you have a panel with version 2.3 firmware, iO-CU 3.5 is required.
Older firmware versions may not be supported in the next CU release.
New in iO-CU 3.5 and Firmware 2.3 Support for supervisory latching and supervisory nonlatching device types for SIGA2-PCOS iO-CU 3.5 and Firmware 2.3 support the new supervisory latching and supervisory nonlatching device types for the smoke element of the SIGA2-PCOS

Firmware 2.3 includes the following new features: • Added support for supervisory latching and supervisory nonlatching device types for the SIGA2-PCOS • Added support for smoke verified device types for the SIGA2-PCOS and SIGA2-PHCOS • Added ability to auto reboot the panel when the firmware is updated using the Firmware Update Utility (FUU). • Fixed the activation count issue, where deleting a device from the Panel UI device list doesn’t update the activation count of the corresponding correlation groups. • Fixed an issue from Firmware 2.20 with iO-CU 3.4, where the SD Duct detectors are shown as PS detectors in the configuration utility “map” window when a read from panel is performed.