The Original Flashbash Hardware schematic has been modified to take advantage of the ST72F264, firstly because of its IAP capability - being able to update the firmware via the serial port. Also the 264 has a Hardware SCI/UART rather than the software uart used on the 254. Below is the instructions required to take advantage of using the 264 SCI/UART.

Pin No	Old Function	New Function
18	TX	BUTTON
19	RX	POWERON
20	BUTTON	TX
22	POWERON	RX

Updating is simply cutting the track to the current connection and wirelinking the new connection.
Make sure the correct firmware is loaded into the micro after the firmware update.

At the moment there is no speed improvement by using the Hardware SCI/UART but its seems a shame not to use it as the 264 has one.

Note The only other change is to the option bytes, please read options.txt for more info.