Can a JMCR SD MMC SCSI Disk Device card reader be upgraded with firmware to a SDHC reader as some say?

Answer 1

Yes... Absolutely! I also have a JMCR SD MMC SCSI Disk Device card reader & I tried putting a 16 GB SD card in it today... it wouldn't format it or read it (at first)... Now my JMCR SD MMC SCSI Disk Device card reader DOES read SDHC cards!!! (Including the 16 GB one it couldn't read a little while ago). The problem is finding the right software online... it isn't easy. If you navigate to Control Panel > find & start Device Manager > Under Memory technology driver ... you should see it listed as "JMicron PCIe SD MMC Host Controller", "JMicron PCIe xD Host Controller", & a few other JMicron devices. You could try updating those drivers. The point is that it is a JMicron Memory device... so if your computer manufacturer keeps an updated list of drivers (such as Toshiba does) you should be able find it under a description related to this.

To do that you have to:

First locate your model number, serial number, and part number (on bottom of laptops or some sticker on any device). Then find your manufacturer's driver source (they should be free). Then find this exact driver/software for your exact device there. Install it and then try it.

Option 2 would be to find and use a driver update program.

Option 3 (Might not be compatible with your system) you could attempt to use the one from Toshiba even if yours isn't a Toshiba... i.e. there is a USB formatting program that works on most systems. Just be prepared to restore your system if this does install on a non-Toshiba device & turns out to be harmful.... and use this only as a last resort at your own risk.

This might damage your hardware / device... so it's entirely up to you.