Don't worry about the 4.3.x firmware, DiagBox will upgrade and downgrade automatically. All you need is to insert the device in the USB, then start DiagBox. The first thing it will do is to check the firmware and upload the proper firmware if needed.
Please be aware that some Lexia clones DO NOT work on Peugeot 307 and C-ziro / Ion and Citroen C5 !!! So if you can see the green LED blinking when you start DiagBox, then try it on another car to see if the problem is with the device.
In my device a 10k resistor missing and C57 capacitor were missing (Picture Lex1). Also, some devices have components missing... Lets hope yours is working..
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