I found the solution:
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The Adafruit Feather nRF52832 bootloader is old version, need to be updated to version S32 6.1.1, but you cannot update to latest version of bootloader using serial COM port yet because the old bootloader is not compatible.
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So, you have to use J-LINK as shown picture below:
- Now, goto the Arduino IDE > Tools > Programmer: > choose "J-Link for Bluefruit nRF52" then click on the "Burn Bootloader" option, if the bootloader is updated successfully, you should be seeing result picture below:
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From here, you can start to upload sketch and burn new bootloader using either serial COM port or J-LINK, in this case I am going to use serial COM port so you may disconnect the J-LINK.
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Set the Arduino IDE > Tools > Programmer: to "Bootloader DFU for Bluefruit nRF52" for any new bootloader to burn in the future.
- To upload sketch, click on the upload button, the success process should be like below:
- DONE.
Hopes this help.