I was thinking simple though, too much simple to be first at it.

1) If the Glo firmware is bigger than the Touch one (koboroot.tgz is 84Mb agaist 67Mb), why we couldn't do the same comparison after the installation? On the kobo itself??

2) I try to look inside koboroot.tgz. The are three files inside the directory .\drivers\ntx508\usb\gadget (arcotg_udc.ko, g_ether.ko and g_file_storage.ko) have different size.
Could it be useful??