I have followed the patching sequence given in the link but just as before there is no "handle update" menu item anywhere that I can see in KSM. So I rebooted and now "handle update" does appear and I have selected "full update" and then it rebooted. So far, so good.
Will use for a day or two and report back.
By the way, it's the first time I used USB from KSM and it worked nicely after some teething problems. Goodbye Nickel! Isn't it a shame that Kobo supply such poor readers and that we have to rely on the great work of
tshering to use these devices to their potential.