bytwo BS550 flash file without password

bytwo  BS550 flash file without password 

MT6580__by_two__U2__BS550__5.1__ALPS.L1.MP6.V2_YUANDA6580.WE.L

Device Brand   : by two

Device Model   : BS550

Device CPU     : MT6580

Device IntName : BS550

Device Version : 5.1

Device Compile : 5/13/2019 1:58:45 AM

Device Project : ALPS.L1.MP6.V2_YUANDA6580.WE.L

Device ExtInfo : U2