G30 - Is it possible to downgrade NBT2 EVO I-Step from 19-11 to 18-03

[nyuly]

Hello all of you , i've bought an nbt evo witch i think it was cleared V850 with Toolset 32 and now it has to be flashed .With E-sys i see only BTLD_00001ffd_ 000_000_001 and HWEL_00002FC3_001_004_001 .When turned on , there is blu screen flashing on display . Did anyone know how to solve this ?? thanks .