Electrostatic Sensitive Devices and Software Management Control
Electrostatic damage
Walking across a synthetic floor can charge a body to several kilovolts. Discharge through a semiconductor junction can vaporise tracks (catastrophic damage) or degrade the device so that it fails later (latent damage). Because damage can pass a functional test and fail in service, handling rules are absolute: a wrist strap with a 1 megohm resistor bonded to a common ground, a grounded bench mat, conductive bags and bins, no ordinary plastic or foam near the bench, humidity around 40-60 percent, ionisers where grounding is impossible, and always holding cards by the edges.
Software management
Airborne software is developed and verified to DO-178C, with the software level (A to E) set by the worst effect of its failure, from catastrophic to no effect. In service, control is through configuration management: correct part number and version, approved media, checksums and load reports, traceable records and formal change control before any load. Verification tools are themselves qualified under DO-330.
Traps
Saying ESD causes only total failure; assuming a laptop in a hangar is harmless; forgetting that an approved version must match the aircraft's configuration; and believing software may be loaded without configuration records.
Rule of thumb
No strap, no touch. For software: if it is not recorded, it did not happen - the load report and part number are the evidence that the correct software is installed.