BLE function not working on nrf52840 rev 3

[hmihmi]

aliexpress.com/.../1005007557383132.html

I bought the above board
I checked the revision information with nrjfprog --deviceversion and it was revision 1
All functions including ble worked well
I bought the nrf52840 chip of revision 3 and removed the revision 1 chip of the above board and installed revision 3
But the ble function does not work

I ran the ble_app_blinky example of nrf5_sdk_17.1.0_ddde560 as is
The source codes of revision 1 and revision 3 are the same
The debug results show that all items proceed without error

Is there anything I need to add in revision 3?

[Susheel Nuguru]

Rev 3 of nRF52840 have improved APPROTECT mechanism. The introduction of that and how it influence your application development is given clearly here in the blog. Please make sure that the changes necessary are included in your app. Other than that, I do not see why BLE does not work as rest should be same 

I tested ble_app_blinky using nrf5_sdk_17.1.0_ddde560  on rev3 and it works fine