any experts would like to share if this is possible? sdhc support tru software update?
btw i know if i buy sdhc card today there will be micro sd card reader included but is it possible that current card readers can support sdhc flash memory too?
It could be. We don't know much about the PIC the R4 uses ( there is no datasheet for it) and it could be possible that there is a way to write to it .
I highly doubt software is possible since the PIC first job is to 'mount' the cart and load the loader files and SDHC has a different address / sector length then SD.