The BT1A is preferably against the older BT1. It has a slightly faster Bluetooth and can be used for iOS and Android. The BT1 is iOS only. A rate of 9/3/3/4 means you received 9 PIDs per second, depending on the engine type this usually means 2 to 3 complete sets of parameters per second. So 2 or 3...

I ordered a BT1 from Amazon but for some reason they sent me BT1A. 1) Does BT1 has any advantages over BT1A (I'm an iphone user so I don't really need BT1A)? 2) The firmware of BT1A is 161 and I can't figure out how to update this damn firmware. I downloaded GoPoint and Gopoint BT1 apps to my phone ...