First part (1)(2)(3) yes,I did.
I could get into testmode just one time. After that, I couldn't get into it.
Second part
(1) Yes, I put sd card with testmode.
(2) (3) Yes, I can turn on it, and I could see the logo, and then it turns black screen until MBR fomat in service mode because of another mistakeî
I can't get into testmode.
Now, I can turn it on and see only black screen.