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CC2541: what is the main difference between ble stack version 1.4.1 and 1.5.1?

Part Number: CC2541
Other Parts Discussed in Thread: BLE-STACK, CC2540

Hi team,

Now i am working with cc2541 when i compare with the stack version 1.4.1 and version 1.5.1, i analyzed main different between is bluetooth4.0 and Bluetooth 5.0.but i want to know what is the main difference in source code between two versions can anyone explain very detailed?