I don't own any Dell (or other OEM manufacturer) systems.
I honestly cannot see that an MBR from a different system...would assist you, but I'm not the smartest person in the world
. The MBR for System A...is not going to be the same as that for System B, as I understand what an MBR is. The fact that Dell employs a nonstandard boot cofiguration...doesn't make it likely that one MBR fits all Dell systems, IMO.
Perhaps your Dell forum can provide that type of info...or an email to the person who suggested such.