Sparkfun LED Matrix + backpack firmware update

Hi,

I'm trying to update the firmware on the backback to reap the benefits of the new firmware. Specifically GitHub - fornellas/SFRGBLEDMatrix: Alternative firmware and Arduino interface library for Sparkfun's LED Matrix - Serial Interface - Red/Green/Blue.

I'm using a mac
I have generated the hex file
I have uploaded the ISP sketch to the arduino
I have a cap between the ground and reset on the Arduino Uno
I have connected the ISCP pins to the target board
then I run the following command:
avrdude -P /dev/tty.usbmodemfd121 -b 19200 -c avrisp -p m328p -v -e -U flash:w:RGB_Backpack_vFPO.hex

and I get the following results:
avrdude: Version 5.11.1, compiled on Feb 16 2012 at 22:11:20
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2009 Joerg Wunsch

Using Port : /dev/tty.usbmodemfd121
Using Programmer : avrisp
Overriding Baud Rate : 19200
AVR Part : ATMEGA328P
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PC2
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :

Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack


eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff
flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff
lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00

Programmer Type : STK500
Description : Atmel AVR ISP
Hardware Version: 2
Firmware Version: 1.18
Topcard : Unknown
Vtarget : 0.0 V
Varef : 0.0 V
Oscillator : Off
SCK period : 0.1 us

avrdude: stk500_recv(): programmer is not responding

The lights on the board blink and the target board is also powered.

Any advice on how to get this firmware across?!

I've got avrdude saying this now:

Programmer Type : STK500
Description : Atmel AVR ISP
Hardware Version: 2
Firmware Version: 1.18
Topcard : Unknown
Vtarget : 0.0 V
Varef : 0.0 V
Oscillator : Off
SCK period : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.12s

avrdude: Device signature = 0x000000
avrdude: Yikes! Invalid device signature.
Double check connections and try again, or use -F to override
this check.

Still need help folks!