Off-topic in feedback forum (I will move it no better on), moreover, it's question answered countless number of times. You decided to keep secret the exact model of switch we are speaking about here - no specific answer is possible.
Read documentation of the switch in question (it is available on Cisco's www), search for answer here on CSC or even use Google.
Generic answer - 'copy tftp:.... flash:...' may or may not apply to the particular switch you have.
