返信来た!
Step 1. Please copy the downloaded .zip achive to your ATOM for upgrade as shown in the attachment.
https://drive.google.com/file/d/1Y2x00nbXXgfPsWQKV014eM93GULe0E9p/view?usp=sharing
Step2. After successful upgrade, enable Developer options: open Settings -> System -> About phone -> Click "Build number" several times until to be a developer.
Step3. Input the command "*#*#34635280#*#*" ->enter EngineerMode -> swipe left to Connectivity -> WiFi -> Tx, disable ch14 as shown in the attachment.
Btw, please close your ATOM wifi before you enter Engineer Mode.