Hi frostschutz ; done it this morning with a kobo glo HD and a sandisk 64go sdxc class 10. It replaces the included 4go class 4 like a charm. The whole process takes less than 15 minutes and for I’m browsing inside the library and books, it seems to me everything is snappier than before (and snappier than my h2o).
The Magic Memory Upgrade Mod is the ultimate tool to update

Thanks a lot for your work.