Hi Simon, Thanks for the info, that's good to know. It looks like all our units are v4.x and that I/D cache fix seems to have only been applied to v5.x which explains our issue. Thanks again, Andrew
We recently ran into an issue and when searching found this thread: [SOLVED] old firmware module that does not handle I/D-cache correctly All of our units that we've looked at so far have host/emu FW 2022 Sep 22 15:00, despite some of these units being quite old now. What determines the latest firmware that a JLink Ultra+ / Plu / Pro can run? and is there any way to get updated firmware for these units? Additionally is there a change log which we can use to work out what changes have been added …