firmware settings

hello there !
can anybody tell me the sprinter firmware settings ? is it compulsory that the baud rate must be 25000? .can i upload firmware with 115400 baud rate ?

Firmware settings are printer specific. You can set the baud rate to whatever your host software can connect to. If you are using Pronterface, 115200 is adequate.

also uploading firmware is not part of sprinter, but is part of the boot loader

So changeing the baud rate in sprinter will have zero effect on firmware upload speed. What it does change is the speed you talk to the computer while its printing and you can set any valid bauds rates.

But!... since its a slow micro some baud rates are not advisable as they have high error rates
for eg on a 16mhz 644p for 115200 baud is 3.7% (will work most of the time)

See the 16mhz table here for more details