upgrading problem

Moog voyager
during the upgrading version 3.5 firmaware SysEx data bank a
there was a problem , power failure, when he returned lost program the

display lost characters ,running out of contrast You can exchange the flash rom ,or the cpu board

Does it mean you can see nothing after power on?
Can you see the LED sequence after power on?
Please let us know.

Thanks solved the problem.

added an auxiliary control in lcd, this way could visualize the characters realized the up grade for new version