Are you sure your product code is TRB140 1*****? Did you used the appropriate firmware TRB1401_R_00.02.03.2_LEGACY.bin?
Basically on the restore method I provided, was enough to install TRB1_R_00.07.01.4 right away, you don't need to use legacy FW.
If you are unable to restore the modem, take a screen shot of Status> System page and send it to me via private message.
I will try to find the right modem firmware version for you, so you could try to update it.