CCNA LAB

HI
I JUST COPY IOS VER 12.0 FROM TFTP SERVER WICH IS MY PC CONNECTED TO MY ROUTER 2500 ON THE E0.
ROUTER#COPY TFTP FLASH
SO I ERASED THE FLASH WHICH HAS VER 11.0
THE PROCESS COMPLETED SO PERFECT.
NOW WHEN I TYPE THE COMMAND
ROUTER#SH VER I SEE THE NEW IMAGE VER 12.0
AND WHEN I TYPE
ROUTER#SH STARTUP I STILL SEE THE OLD VER 11.0
THE PRBLEM IS MY ETHERNET 0 IS UP I CAN PING ALL THE OTHER ROUTERS BUT NOT THE TFTP SERVER (MY PC)
I WANT TO COPY BACK MY OLD VER 11.0 TO THE FLASH OF MY ROUTER BUT I CAN NOT EVEN IF IT’S STILL IN THE NVRAM.
PLEASE I NEED HELP.
THANKS