Thanks for the reply and the upgrade Jerry
My Nano is a DSO nano 201 with a pcb V1.5C_MB with e_Design on the back of the case, it’s not one of the new ones with the buttons in a single vertical column, I bought it on Ebay, that was before I found out that not all Nanos are not necessarily the same, had I realised I would have paid a bit more and bought the official Seeed version to be sure that there won’t be any compatibility problems.
I have got version 2.5 working now all it needed was the lib.dfu loaded before the app.dfu, I used lib v2.2.
The overall colour scheme of version 2.5 doesn’t look as visually appealing as Paul’s V1.5 as there doesn’t seem to be much use of colour variations but I’m more interested in what the differences in behaviour and functionality to be honest.
I have managed to rebuild the v2.5 code using IAR4 but would like to know more about what the lib is providing, is that a separate build of another set of sources?