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Is it possible to replace a firmware that uses OTA?

I bought a wristband that enables firmware upgrade via OTA. 

I want to replace its firmware with my own but I don't have the keys related to the DFU.

All I know is that it was using SDK 15.3

Is it possible to replace the firmware with my own - if yes, how do I make a bin file?

Will it be possible to replace it again with the original firmware later?

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