So we use the fw file and update
after 100% complete we select .bjn file and update again?
Or we have to use mi fit in between???
Because this is a non-public firmware, you MUST use a special MiFit version with auto update disabled (non-OTA version), or the latest public firmware v1.0.6.16 will always be installed automatically.
Then use Notify & Fitness to install those 2 files, one after the other (it doesn't really matter which one first) and you are ready!