VMware VSphere Hypervisor ESXi 6.5.0U2-8294253 ISO (2018)l: Features, Benefits, and Requirements

Should you need to continue with the upgrade, an upgrade using the ESX7.0U2 ISO file will avoid this issue.However, as per the above, this is not recommended at this time. -vSphere/7.0/com.vmware.esxi.upgrade.doc/GUID-77D42D81-F47E-4FE9-B4B2-B15AB16C9C1A.html

Downloaded vSphere system logs are invalid This issue might occur if the client session expires while the downloading of system logs is still in progress. The resulting downloaded log bundle becomes invalid. You might observe an error message similar to the following in the vsphere_client_virgo.log file located in /var/log/vmware/vsphere-client/logs/vsphere_client_virgo.log:

VMware VSphere Hypervisor ESXi 6.5.0U2-8294253 ISO (2018)l

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com.vmware.vsphere.client.logbundle.DownloadLogController Error downloading logs. org.apache.catalina.connector.ClientAbortException: java.net.SocketException: Broken pipe (Write failed) at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:407) 2ff7e9595c