Need to upgrade OS v_11.5.2-HF2 to v_11.5.4

The exact commands will depend on if you also need to create a new HD/Partition for 11.5.4, or if you can override an unused install on another (currently inactive) partition. For a start, can you paste all output from command 'tmsh list sys software volume' (use code block please). Also, please specify your HA setup - do you have two units in Active/Standby pair? Regards,

You can use following command;

 

tmsh install sys software image volume HD1.x

 

make sure you do md5 checksum before installing the code to HD1.x volume. To check which HD1.x volume is available for installation use;

 

tmsh show sys software

 

It is Standalone.

Is there a reason to not use the WebUI if you are unfamiliar with the installation process?

 

In any case, I highly recommend reading the docs:

 

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-11x-software-upgrade-11-5-0.html