RE: D630C Bios
You may find this useful, It is the file sheet for the D630 and has information on the various BIOS revisions.
I checked to see if there was any order in which the BIOS could be updated and wasn't able to find anything. If you aren't able to update to 19 directly, you may want to try updating to 12 first and if that works try 13. I know it isn't convenient but it may be why you are having difficulties updating to 19.
I hope that this helps.
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