Someone cleared the Flash from a Cisco 3550 48 SMI at my work (It probably needed updating anyway) and I'm trying to simply transfer the newest IOS onto the switch. I keep getting errors and everything i've found online has been no help. When transferring using Xmodem, the window counts up to 9 retries with the "Last error" field showing "Got Retry Request". Then i recieve a box telling me "File transfer error limit exceeded. These errors are preventing successful transfer file. Please see Troubleshooting in online documentation." I originally tried to connect at 115200 8-N-1 in order to speed up the transfer but i also tried 9600 after the first time i recieved the error. Also, i've tried using both Xmodem and Xmodem-1k. Here is a copy/paste of what i've done.
switch: format flash:
Are you sure you want to format "flash:" (all data will be lost) (y/n)?y
flashfs: 0 files, 1 directories
flashfs: 0 orphaned files, 0 orphaned directories
flashfs: Total bytes: 15998976
flashfs: Bytes used: 1024
flashfs: Bytes available: 15997952
flashfs: flashfs fsck took 14 seconds.
Filesystem "flash:" formatted
...The flash is already initialized.
switch: copy xmodem: flash:c3550-ipbase-mz.122.44.SE6.bin
Begin the Xmodem or Xmodem-1K transfer now...
CCCCCxmodem:: I/O error
Unknown cmd: BB0