Hi sanshiro55 and welcome here. I don't think Ricoh folks follow this forum. Definitely not on a regular basis. But I'm used to pass them the problems discussed here.
As for the error 36, do you connect the GR to Mac using included usb cable or do you receive this error while transferring the fw file using internal/external card reader? How exactly do you transfer the file? Did you unpack the fw file first or you simply open the zip in finder and drag&drop the fw file to sd card?