Reply to Firmware upgrade questions basic but important????

After finally finding a computer with a serial port, this will get harder every year, I have had a go at upgrading the firmware. Firstly Ean, please update your video. Why say it is strongly advised to use a serial to serial conect, but show a USB conection??

I followed the video step by step only to realise it isn't as difficult as it seems. However if using a serial to serial connection - you need to power the unit - doh, where is that in the step by step video?

Questions

What postion does the power switch need to be when finished, right, middle or does it not matter??

All the instructions say it needs to be undertaken on a PC, why when I downloaded the file was there a Mac file option? I use a mac to run Traktor, should I have used the Mac file or the PC file which I chose.??

Grateful for any answers.

CB