dear friend i made gtp-usb plus but i don't have firmware so if any body having firmware of gtp-usb plus so send me at digitalraj@rediffmail.com and i tried old firmware of gtp-usb summer is not working.
thanking
Why to search for firmware which is hard to get? Just go for a Pickit2 clone which is easy to assemble, Popular and available with all details including the firmware. Some links are given here.