The contents of region 14 and fw_all.bin are identical except that region 14 is bigger [naturally] and a dump of 14 should show them to be identical if they're the same version, other than the dump will be ~50MB and latest V4.00 fw_all.bin is 8.47MB. If the extraneous FFs are removed from the dump the files should then be identical.

So one way to see if your rgn14 is corrupt is to dump it and compare it. If it is, then you can replace the necessary bytes and write back using xrgn command in update.txt. I think you should also dump rgn83 and open the bin file with PowerISO [for example] to check the file system. It maybe is just that you're missing some needed files or there's corruption. For instance when no keyboard files are loaded, Keyboard Version will show as 'Unknown' and no voice files will result in 'missing' for Audio.