Flashing a H140 is the most critical phase of the whole rockbox procedure, somehow you messed up the procedure, unfortunately there is nothing that can be done here or at mistic.
Your only option is to send the unit back to iriver and ask them to re-flash your unit, its an easy procedure for them.
I'm curios, is this your first attempt at installing Rockbox ?
and
Which procedure were you following to flash your unit ?