GX6701 cant boot from USB

Hello, is this repo still active?
I am trying to reuse a GX6701 set top box into a linux PC
I tried flashing the img file, but the STB can not load.
I can change the firmware by using other GX6605 STB, renaming it into GX6701_T2.bin

Is there any way I can run a small linux app on this STB please?
Thank you.