The attached is the latest firmware for iUSBport Camera.
1.) It fixed the Nikon D7100 tap focus issue.
How to update firmware?
1.) Prepare a USB flash drive and save the attached firmware into it, keep the file name as it is.
2.) Insert the USB flash drive to the unit and power it up
3.) Wait till the screen shows "Update vxx to v42" and press power button one time to proceed
4.) The unit will be off once the firmware update is completed