Bootloader download, where?

After i did some testing with a externa EEPROM my NANO fails to react.
As i suspect that this action somehow killed the bootloader i am trying to program my NANO v3.0 with a bootloader.

But where can i find the bootloader file to be used with AVER studio to download to the device using the ICSP connector on the board.

Regards

Harry

The Arduino 'boards.txt' file tells you where to find the bootloader for each type of board. For example:

##############################################################

atmega328.name=Arduino Duemilanove or Nano w/ ATmega328

atmega328.upload.protocol=stk500
atmega328.upload.maximum_size=30720
atmega328.upload.speed=57600

atmega328.bootloader.low_fuses=0xFF
atmega328.bootloader.high_fuses=0xDA
atmega328.bootloader.extended_fuses=0x05
atmega328.bootloader.path=atmega
atmega328.bootloader.file=ATmegaBOOT_168_atmega328.hex
atmega328.bootloader.unlock_bits=0x3F
atmega328.bootloader.lock_bits=0x0F

atmega328.build.mcu=atmega328p
atmega328.build.f_cpu=16000000L
atmega328.build.core=arduino

This means hardware/arduino/bootloaders/atmega/ATmegaBOOT_168_atmega328.hex

Question: should i upgrade from IDE version 0023 to 1.0 or are both bootloaders the same?