There are three ways for L3+ to restore factory settings.
1. Reset Restore (This method can be applied within 10 minutes when the miner boots.)
After powering on the miner for 2 minutes, please press "Reset" button for 5 seconds, then release it. The miner will be restored factory settings within 4 minutes and automatically restart. (no need to power off the miner)
Click Upgrade ---> Perform reset, then click “Ok” on the pop up window.