I recommend try to do nindy as below.
PLEASE WAIT FOR ANOTHER ONE TO CONFIRM THE BELOW STEPS

Max TNT
·    Remove power for the box.
·    Connect to the console port at 38,400 bps.
·    For release 1.2Ap5, set the shelf controller twist dial to 0 (zero),
for Release 2.x, remove the shelf controller, open it and short P1. Replace
the shelf controller.
·    Power cycle or reset the TNT.
·    EF
·    DF
·    Load the boot-sr file (TNTSR.BIN or TNTSRE.BIN)
·    If you removed the shelf controller to short the jumper, remove the
power, remove the shelf controller again and remove the jumper from P1 and
reassemble.