I've bought (got for Christmas!) A Pentax 50mm 1.4f lens, but when I connect it to the body, it immediately comes up on the screen 'firmware update failed. Try updating again' 'memory card containing firmware is required to update' I put my card in my laptop and downloaded the latest update, 1.0.5 and it successfully updated BUT it still says it when I contact the lens! Won't let me do anything when it's on but as soon as my canon 18-135mm is back on the body it works perfectly... Any ideas or advice? Very new to this!