basically bluetooth is (hardware+software design)
bluetooth 2.0 EDR(Ehnance data rate) is not be use as 4.0 because it is hardware specifically design for special data rate 3 Mbit/s practically.
if you want to change it to 4.0 , you need to change the bluetooth hardware. which must follow all protocols and design of 4.0
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basically bluetooth is (hardware+software design)
bluetooth 2.0 EDR(Ehnance data rate) is not be use as 4.0 because it is hardware specifically design for special data rate 3 Mbit/s practically.
if you want to change it to 4.0 , you need to change the bluetooth hardware. which must follow all protocols and design of 4.0