Which bootloader is on MEGA 2560 R3?

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i'm trying flash mega 2560 bootloader of mega 2560 r3. wonder bootloader is. looked in folders of arduino ide 1.0.x , v2. have mega 1280 too, comparable version board too? thanks.

the reason wanted upgrade using r3 , arduino official wifi shield didn't see "sd card not present" error while regularly see mega 1280 , mega 2560. it's annoying. had remove , reinsert sd card. difficult since sd card points towards side inside project boxes. had open box this.

i think "v2" in bootloader name part of stk500v2 (the updated protocol necessary larger chips) , not part of "mega 2560 rev2".

the boards.txt file says bootloader install , find it:
quote

mega2560.name=arduino mega 2560 or mega adk
mega2560.bootloader.path=stk500v2
mega2560.bootloader.file=stk500boot_v2_mega2560.hex


on mac translates to:
/applications/arduino 1.0.5.app/contents/resources/java/hardware/arduino/bootloaders/stk500v2/stk500boot_v2_mega2560.hex


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