Picoborg reverse not found

This is all rather strange, I am not sure why your hardware changes would affect the PicoBorg Reverse so much.

One thought is that it may help to slow the I2C down slightly and see if it then works. Look for the RawRead function in PicoBorgRev3.py and add in the highlighted line below:

    def RawRead(self, command, length, retryCount = 3):
        """
RawRead(command, length, [retryCount])

Reads data back from the PicoBorg Reverse after sending a GET command
Command codes can be found at the top of PicoBorgRev.py, length is the number of bytes to read back

The function checks that the first byte read back matches the requested command
If it does not it will retry the request until retryCount is exhausted (default is 3 times)

Under most circumstances you should use the appropriate function instead of RawRead
        """
        while retryCount > 0:
            self.RawWrite(command, [])
            time.sleep(0.01)
            rawReply = self.i2cRead.read(length)
            reply = []
            for singleByte in rawReply:
                reply.append(singleByte)
            if command == reply[0]:
                break
            else:
                retryCount -= 1
        if retryCount > 0:
            return reply
        else:
            raise IOError('I2C read for command %d failed' % (command))

With any luck all you need is a slight delay between the sending and receiving, in which case this should fix things :)

If that does not help my only remaining idea at this point is that some other bit of software is altering the behaviour of the I2C pins in a way that it should not be...