Some Lexia 3/XS Evolution diagnostic interface owners reported that normal lexia-3 PP2000 V25 Diagbox V7.57 can not work on Peugeot 407, but better quality lexia3 firmware are possible to access even Pug407 till 2014 year. Obdexpress.co.uk has several lexia cables in stock. Item No SP08-C is the best quality with original 921815C chip that works on Peugeot 407 and Citroen C5.
If you want to get real picky and go for best quality chips and check for NEC chips exactly like ours:
Best quality LEXIA 3 V48 PP2000 V25 Diagbox V7.57 with original 921815C chip PCB board:
PS: Different Lexia 3 PP2000 Diagbox comparison table list: