There have been some posts about loosing the ability to get to their miners.
If you take a look here:
https://shop.bitmain.com/support.htm?pid=007201604120945219855QObfk20066CYou can get the downloads to burn a SD card to restore your firmware for the L3+, D3 and A3
***The L3+ is not the same as the L3***
If you put the wrong firmware on you will probably own a paperweight.
Just posting this because several people have had issues and it's not on an obvious spot on the Bitmain page
-Dave