How to Update keypad Firmware?

Discussion Questions
1

I cant Update keypad Firmware, Error 21, how to fix?

Screenshot_2021-02-23-13-18-30-469_io.nuki
Screenshot_2021-02-23-13-18-30-469_io.nuki1080×2340 132 KB

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2

It didn’t work with my Redmi Note 8 Pro but with a xiaomi Mi 9!