FW Update

Backup current FW

dir flash:
copy flash:/c3560-ipbasek9-mz.122-55.SE12.bin tftp://192.168.28.199/c3560-ipbasek9-mz.122-55.SE12.bin

This is recommend method. It will install all files (i.e. webui pages) from tar archive (not only firmware binary).

enable
! make free space 
delete flash:/c3560-ipbasek9-mz.150-2.SE11.bin
archive download-sw /overwrite tftp://192.168.28.199/c3560-ipbasek9-tar.150-2.SE11.tar
reload

Upload new firmware:

! check free space:
show flash
dir flash:
copy tftp://192.168.28.199/c3560-ipbasek9-mz.150-2.SE11.bin flash:/c3560-ipbasek9-mz.150-2.SE11.bin
 
conf t
no boot
boot system flash:c3560-ipbasek9-mz.150-2.SE11.bin
exit
wr mem
reload

Idea is to upload missing firmware file using console cable and XModem transer.

apt install minicom
minicom -D /dev/ttyUSB0

! switch terminal to faster spped
set BAUD 115200
 
copy xmodem:c3560-ipbasek9-mz.150-2.SE11.bin flash:c3560-ipbasek9-mz.150-2.SE11.bin
 
! CTRL+A+Z and choose send file from minicom menu
! when transfer finishes:
 
unset BAUD
 
boot flash:c3560-ipbasek9-mz.150-2.SE11.bin