I have just attempted to upgrade my Picstart B1 with the following. A new 17C43 loaded with Pheonix B software as per Newfound Electronics via Dontronics site etc, the problem is the software TM4 does not recognise the programmer and returns with Rxd Txd errors etc. I think the problem may be a fluffed program download as I set the Oscillator as an EC external clock and not the XT or LC selection. I think the XT should have been used? The other note on the Phonix B hex file is that when loaded into MPLAB IDE the listing shows a few lines with Illegal Opcode? Surely the prog will not run with this problem? Any help welcomed, please reply to - ashsparky@clara.net - with any sugestions, I would like to here from any other people who have upgraded and had problems etc.