" There is no way to rule out a bomb causing damage to the electrical system or even explosive decompression. The time frame for the ACARS messages, abrupt end to the messages, and lack of voice communication all suggest that things went wrong very quickly.
lets try again- approx 2 min plus between smoke- window fault befgore acars quits. NO signals re decompression or cabin differential, no signals re dump valves and air pak changes, etc.
Decompression via explosives or otherewise (open lor broken window ) as an initiator before going offline is NOT likely.