Hello, Last nigth, Thomas Graff and I did some debuging of libusb, and we found out that my 2 weeks old problem wasent with Libusb but in uhci driver.. If/when libusb asked for a string of 255 bytes (max size of strings) the uchi driver whould STALL and the stack whould hang :/ The usb documentation clearly state that its leagal to ask for a big buffer and just get a smaller one returned.. so that one bug for the Sirion team to work out, but for now I have made a small workaround for strings but I dont think this workaroung will work for bulk/interrupt read/writes but time will tell. Wrigth now there is only bulk/interrupt read and write that are missing before its finished, all the init code seams to work. My little test program that scan the devices fully works, so I really need to find a driver there uses bulk or interrupt so I can finishes the last functions. I dont know if anyone has started porting SANE? for I'm pretty sure SANE uses interrupt or bulk for scanning. so MAYBE i'll have a look at it. PS: I'm pretty glad that we found this irritation bug, it have honted my the last 2 weeks :D <- (Yes I'm happy now) PSS: If there is some OS4 beta testers ind here that want to tryet for me, so just say so. (its have to be os4 betatester for I use some new functions that are not pressent in OS4 Update3) PSSS: sorry its goes at this low speed, I'm really trying to do my best but there is so mutch USB stuff I had to learn and now it seams I'm also figting with Sirion bugs... not easy I tell you. Kind regards Rene W. Olsen