Hm, very strange, that it doesn't work. Normally there should be a "Firmware is decompressing" message after the popup.
Was your H delivered with the current firmware? Or did you updated to 2.15 by yourself? Maybe some SD card issues, because you mentioned, that you also tried with the original firmware filE]
Yes most others seem to manage . I am working on an update E file. I do get uploading first and then decompressing but it is the part 3 that does not kick in. The pop up that comes after saying do you wish to continue apparently does nothing more. I doubt it is the SD card buy I will give that a go. It does seem to save lot of boot time and stops signal drop out