Error code 12 or 30 may mean the controller has been damaged.
M215 G340 / Older name BBS0102B 48V / pre-programming 22amps / 750Watts Nominal
M615 G320 /OLD NAME BBSHD 48V / pre-programming 30amps / 1000watts Nominal
We only the stock the 2019 latest controllers. Bafang has revamped their product lineups one more time in Aug 2018.
All controllers have been pre-programmed by VOLT.