I tried upgrading my 501 from 5.2(3) to 6.0(4). I used the copy tftp flash method, which appeared to complete successfully. The 501 will not now boot up fully. I get the option to escape to monitor mode, but if I try to boot from flash I see the following: Use BREAK or ESC to interrupt flash boot. Use SPACE to begin flash boot immediately. Flash boot in 10 seconds. 9 seconds. 8 seconds. 7 seconds. Reading 2482688 bytes of image from flash. 16MB RAM Ignoring PCI card in slot:0 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) Ignoring PCI card in slot:1 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) Ignoring PCI card in slot:2 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) Ignoring PCI card in slot:3 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) Ignoring PCI card in slot:4 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) Ignoring PCI card in slot:5 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) Ignoring PCI card in slot:6 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) Ignoring PCI card in slot:7 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) Ignoring PCI card in slot:8 (vendor:0x1022 deviceid:0x3000 revisionid:0x0) No system flash found. No thread name Traceback: 0: 800bf6d4 1: 8000081c 2: 80000223 Is there any way out of this??? thanks, Bobby