After upgrading a HA cluster to SPS version 6.0.0 on the Basic Settings -> High availability page the Current Boot firmware version of the Slave node shows the previous version instead of 6.0.
The actual running firmware is the "Active" firmware which is 6.0.0. The "Current" firmware is the one which would be started during the next reboot.
This is a known issue in version 6.0.0 and 6.1.0. The reason is the symbolic link of the "Current" firmware is not updated during the upgrade process.
It is also possible to correct the firmware link manually the following way:
ln -s scb-boot-6.0_6.0.0-6.0.0 current