Re: [WTS] [EU] 600pcs BW L21 LITECOIN MINER with PSU, escrow, 125 EUR/pc
Cool. 
I have a BW-L21 guide if you need any tips for it https://bitcointalk.org/index.php?topic=2118409
I have a BW-L21 guide if you need any tips for it https://bitcointalk.org/index.php?topic=2118409
HagssFIN has a whole topic dedicated to the miner with firmware updates and different guides. This is probably the best place to find info. I can also find the firmware link for you and post it-