Hi, Have an intresting issue that someone maybe able to help with. But have one 5350 that will load fine and another that will not. The difference between the two seem to be the product ID number (revision). The 5350 with productID 0x1403 that doesn't seem to work. Yet happen to have a 5350 with productID 0x1405 that works great. The 5350 product ID 0x1403 apparently is working under Windows so not sure what may be going on. 53050 0x1403 fail kernel messages ----------------------------------- [ 38.999626] i2400m_usb 1-6:1.0: firmware: requesting i2400m-fw-usb-1.4.sbcf [ 39.361610] i2400m_usb 1-6:1.0: boot-mode cmd 2: incomplete transfer (512 vs 16384 submitted) [ 39.361746] i2400m_usb 1-6:1.0: fw i2400m-fw-usb-1.4.sbcf: section #1 (@644 16384 B) failed -5 [ 39.361865] i2400m_usb 1-6:1.0: fw i2400m-fw-usb-1.4.sbcf: download failed: -5 [ 39.361994] i2400m_usb 1-6:1.0: cannot bootstrap device: -5 [ 39.389521] i2400m_usb 1-6:1.0: cannot setup device: -5 [ 39.389647] i2400m_usb: probe of 1-6:1.0 failed with error -5 [ 39.389734] usbcore: registered new interface driver i2400m_usb 5350 0x1405 successs kernel messages ------------------------------------ [ 4.409274] i2400m_usb 2-3:1.0: firmware: requesting i2400m-fw-usb-1.4.sbcf [ 7.212613] i2400m_usb 2-3:1.0: firmware interface version 9.2.0 [ 7.220479] i2400m_usb 2-3:1.0: WiMAX interface wmx0 (00:1d:e1:02:4d:0e) ready <--- THIS IS THE LINE YOU WANT TO SEE [ 7.220642] usbcore: registered new interface driver i2400m_usb [ 7.223753] i2400m_usb 2-3:1.0: 'RF Control' (0x4602) command failed: -84 - invalid state (3) Thanks, Jerone