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Flash firmware with nRF Connect APP

Download nRF connect APP
Download Firmware files to your Phone from "10 Minutes Sleep Firmware" Tab
Step 1
Turn keyboard off, press and HOLD 4 keys then turn keyboard on.
Step 2
Open nRF Connect App, will see KCDFU in the Scanner tab, then connect it.
Step 3
Click "Open Document Picker", select the file you downloaded earlier (Which Keyboard/side you have?) then click "Start".
Step 4
Waiting for the progress bar to reach 100%. Done! Do step 1-4 on the other side.