Amazon Fire 7 Lineage 12.1 (2 Aug 2017)

Fresh installation from FireOS or other ROM FlashFire >= 0.57
- Click the Red + and choose 'Wipe'
- Ensure System data, 3rd party apps and Dalvik cache are CHECKED
- Click the Red + button and choose 'Flash ZIP/OTA'
- Navigate to and choose the latest Lineage ROM Zip
- Accept defaults
- Click the Red + button again and choose 'Flash ZIP/OTA'
- Navigate to and choose the latest Open Gapps Zip.
- Accept defaults
- Move "Wipe" to the Top of the order
- Press the big FLASH button.
- Ignore any warnings that appear