I tried too. Same error and problem!! But only using R2T002 with different language too. Main good but the FS flashing stop at 20%. I used XS++ SEMC with serial cable or DS-25 or mini-usb cable with different speed, but nothing, same problem.
Using other firmware as R2BA009 for K608 or K600 all works fine.
@..:: n/a : Are you resolved it?