Build Freedom E300 MCS file for Arty 35T

Hi everyone, I have an Arty7 35T board and I am new with RISC V. I have completed for building the mcs and verilog file from sifive/freedom repository. But when I flashed the mcs file to board, nothing happened, no “hello” on serial, no led blinking. I have read some documents, they said that the 35T boards are no longer support. How can I work on 35T board now, thank you very much.!