need firmware

Can someone send me firmware that will work
? I have tried everything my printer has not worked for 4 weeks. Desperate please help.
I have a prusa i3 with Arduino 2560 mega all I wanted was to change platter size and now nothing work . Tried to upload new confic h nothing works.

Hi Mate,

Just a few more questions for you to answer,

1) Has the printer been working in the past
2) What firmware are you currently trying to upload (Marlin, repetier)
3) Is the firmware uploading or are you getting an error message
4) What host software are you using, (pronterface repetier)
4) If the firmwear is uploading, what is the printer doing that is making it not work? Ie are the motors moving, do the end stops work

Are you trying to use configuration.h from a new version of marlin with an old version? That will never work. The best thing to do is to download the latest version of marlin and configure it to your printer. If you do not know how to configure your Marlin see the following link: [www.youtube.com]. The latest version of Marlin can be found at [github.com].