Sanguinololu 1.3a sync error

[bummer6]

I've got a Geeetech Prusa i3 pro with the Sanguinololu 1.3a board on it. For whatever reason I can't flash the firmware. I simply get a sync error whenever I try to flash it. I've replaced the lead screws, so I need to flash the firmware to calibrate the zsteps since it also wont accept an M500 command to save my settings to EEPROM. Here is the error I'm getting in Arduino IDE:

"avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x39"

And here is a screencap of my settings.
https://imgur.com/a/wg7my

I've been trying to flash the board for days now with no luck. Any help would be greatly appreciated.