Arduino mega at2560 overclock 20mhz

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i hope someonr me.

i've ask intalian forum without success ( me doesn't work )

i need use at2560 @ 20mhz becouse need drive matrix display

( 2 project 1 sure 3216 bicolor 3 panel , 1 rgb matrix panel adafruit)

so why need more "power"!

they suggest me change ( add) in board.txt file atmega configuration @ 20mhz (done)

now 20mhz oscillator board doesn't work becouse bootloader don't accept new oscillator.

so need bootloader works @ 20mhz. think should burn via icsp.

so posted ( see in italian section) hex file bootloader 20mhz oscillator.
the problem appear when ili try burn it. ( see picture error)

the original bootloader 21kb while midified 25kb

could post working bootloader atmega2560 run @ 20mhz ?

thank much

daniele

quote
so why need more "power"!
are sure code optimised , cannot use arduino @ native speed ?


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