Download Firmware Ubiquiti UniFi UAP/USW 4.0.42.10433

Ubiquiti has released new firmware for its wireless products that fall in the UAP and USW series. This again addresses several points. The version number is pinned to 4.0.42.10433, with the following announcement and list of changes:

[FIRMWARE] 4.0.42.10433 for UAP/USW has been released | stable

We’ve prepared firmware 4.0.42.10433. Please see below for the changelog and links to the firmware binaries.

Firmware changes since 4.0.21:

• [UAPG2/G3] Fix corrupt UBNT IEs.
• [UAPG2/G3] Handle broadcast DHCP replies properly while using dynamic VLANs.
• [UAPG1/G2] System optimizations.
• [UAPG2] Fix 100FDX negotiation issue after wired uplink state change.
• [UAPG2] Fix downlink AP crash when using a DFS channel for wireless uplink.
• [UAPG2] Fix wireless uplink priority selection fail.
• [UAPG1] Fix Ethernet negotiation.
• [UAPG1] Fix issue causing no Ethernet link when link partner uses manual negotiation.
• [UAPG1] Fix remaining issues with establishing an Ethernet link.
• [AC-Pro/EDU/M-Pro] Fix performance regression in 4.x when uplink is 100Mbps.
• [HD/SHD/XG/BaseStationXG] Fix mDNS leak when Broadcast and Multicast Filter enabled.
• [HD/SHD/XG/BaseStationXG] Fix reset button behavior.
• [HD/SHD/XG/BaseStationXG] Stability and compatibility improvements when using `Auto-Optimize Network` or `High Performance Devices`.
• [HD/SHD/XG/BaseStationXG] Update kernel.
• [HD/SHD/XG] Fix bug causing lower than expected MCS and throughput when TX power >=25dBm.
• [BaseStationXG] Fix GPS support.
• [nanoHD/IW-HD/UDM-B] Add association tracking support.
• [nanoHD/IW-HD/UDM-B] Add support for `High Performance Devices` (also part of `Auto-Optimize Network`).
• [nanoHD/IW-HD/UDM-B] Add support to display which client STAs support Fast Roaming.
• [nanoHD/IW-HD/UDM-B] Enable client STA keep-alive support.
• [nanoHD/IW-HD/UDM-B] Fix 802.11w (PMF) provisioning.
• [nanoHD/IW-HD/UDM-B] Fix a crash when running RF Environment scanning.
• [nanoHD/IW-HD/UDM-B] Fix a null pointer access issue.
• [nanoHD/IW-HD/UDM-B] Fix AndesSendCmdMsg warnings.
• [nanoHD/IW-HD/UDM-B] Fix downlink AP TX rate degradation issue.
• [nanoHD/IW-HD/UDM-B] Fix false anomalies/failures.
• [nanoHD/IW-HD/UDM-B] Fix some memory leaks.
• [nanoHD/IW-HD/UDM-B] Fix speed regression caused by unaligned access.
• [nanoHD/IW-HD/UDM-B] Fix TX retry and drop count.
• [nanoHD/IW-HD/UDM-B] Fix wireless uplink packet forwarding issue.
• [nanoHD/IW-HD/UDM-B] Improve multi-client performance.
• [nanoHD/IW-HD/UDM-B] Stability improvements.
• [nanoHD/IW-HD/UDM-B] System optimizations.
• [nanoHD/IW-HD/UDM-B] Tweak WiFi Experience scoring.
• [UDM-B] Disable RF Environment scanning as it’s unsupported.
• [UAP-IW] Fix behavior so ports are switched instead of isolated.
• [UAP-IW] Fix link flapping and switch VLAN behavior.
• [UAP-IW] Fix port/management VLAN provisioning.
• [UAP-IW] Fix reported inittab respawn errors.
• [UAP] Add DFS backup channel feature.**
• [UAP] Add initial RFC-5176 support.**
• [UAP] Add U-NII-2C support for Panama country code.
• [UAP] Fix a bug which causes mcad to be removed unexpectedly after a provision.
• [UAP] Fix a bug with guest portal redirection.
• [UAP] Fix and improve User Groups support.
• [UAP] Fix Apple Watch support when using `Auto-Optimize Network` feature.*
• [UAP] Fix connectivity issue for 2.4GHz only devices when using `Auto-Optimize Networks` or `High Performance Devices`.
• [UAP] Fix false `Blocked by access control` anomalies.
• [UAP] Fix false DHCP timeout/failure anomalies.
• [UAP] Fix incorrect/lower than expected 2.4GHz TX power limits.
• [UAP] Fix issues when multiple guest networks on an AP.
• [UAP] Fix RADIUS failover behavior.
• [UAP] Fix RF Environment scanning bug which caused APs to require a power cycle after running a scan.
• [UAP] Improve client STA compatibility when using `High Performance Devices` (also part of `Auto-Optimize Networks`).
• [UAP] Regulatory updates for Russia.
• [U-LTE] Disable RF Environment scanning as it’s unsupported.
• [USW] Fix timeout issue when provisioning 200+ VLANs.
• [UIS] Improve PD compatibility.*
• [USW-Pro/XG-6POE] Add initial routing support.**
• [USW-Pro/XG-6POE] Fix a bug that may cause the in-row SFP port to disable when setting an Ethernet port to Disabled.
• [USW-Pro/XG-6POE] Further improvements to PD autodetection.
• [USW-Pro/XG-6POE] Improve handling when no uplink detected.
• [USW-Pro/XG-6POE] Improve PoE reliability.
• [USW-Pro] Add LCM brightness/sync support.**
• [USW-Pro] Change throughput update interval on LCM to 1 second.
• [USW-Pro] Fix a rare bug in LCM initialization during boot.
• [USW-Pro] Improve reliability of LCM sync feature.
• [USW-Pro] Tweak LCM touch event behavior.
• [USW-Flex] Fix a bug which may prevent device from booting.
• [USW-Flex] Improve device initialization reliability.
• [US8] Disable IPv6 on VLAN interfaces.
• [USW] Add Wired User Experience support.**
• [USW] Fix 10/100Mbps manual negotiation.
• [USW] Fix false PoE overload events.
• [USW] Fix SNMPv3 data leak without auth.
• [USW] Improve Fault Status text when checking PoE info via shell.
• [SEC] Fix CVE-2019-8912.
• [HW] Fix alerts generated when inittab restarts a process.
• [HW] Fix STUN URL resolution.
• [HW] Fix support for Custom Upgrades via FTP.
• [HW] Miscellaneous bug fixes and improvements.

*UIS-8-450W upgrading from 4.0.33 and earlier will have their PoE firmware upgraded automatically to improve PD compatibility. That process will take a few minutes. PoE will be unavailable during the upgrade process.
**Controller support pending/varies