HAPPY END REPORT: I have done it! Yes, I now have a perfect Kobo Aura HD with 64GB of internal memory (now I may be tempted to try a 128GB card in it --- if I find them somewhere cheap enough
Now, I have the following question: has anyone seen the motherboard layout of Kobo H20? I.e. is the internal microsd card located in the same position as on Kobo Aura HD? I want to know if I can do the same upgrade on an H20 as well.