& @basu405
Maithili is not written in Bangla script.
Maithili has/had it's own script known as Mithilakshar (or Kaithi too [ Tirhuta also] ) The script looks like bangla but it is NOT Bangla.
Now a days Dev Nagri is well accepted script for Maithili the 'schedule 8' language of India and 2nd official language of Nepal.