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3.1 Firmware is the startup rulebook

Lesson
Hardware safety: isolate power; never open a PSU.

Before touching hardware

  • Follow the exact model's service instructions. Shut down, unplug mains and peripherals, and disconnect any internal battery as instructed. Sleep, the PSU switch, or unplugging a laptop charger alone does not fully isolate power.
  • Let parts cool. Use a clean, dry workspace and approved ESD precautions. Hold boards by their edges, avoid contacts, account for screws, and never force connectors.
  • Never open a PSU or insert tools through its vents; stored energy can remain after unplugging. Use only modular cables confirmed compatible with the exact PSU model.
  • Isolate power before every physical change or cleaning. Powered tests are software/external observations with hands and tools out. No live probing, unspecified pin bridging, or damaged-battery servicing.
  • Stop for damage, swelling, liquid, burning smells, or unclear instructions; consult qualified service. Photos, diagrams, and supplied readings are sufficient for these exercises.

Service and ESD guidance · Example PSU cable chart. Check your exact model.

Practice lab

0 / 1solved

Saved on this device. Practice is ungraded.

Investigate

Prepare a customer’s CPU upgrade

A customer has bought a CPU for board S1, which still runs firmware 1.80; the new CPU requires 2.10+. The existing CPU works, and the manual supports updating with it or through the documented CPU-less port. Plan and verify the supported update before the swap, using the exact board revision’s file and uninterrupted power.

Decision 1

Support table versus sticker

Which decision follows the supplied support entry?

Lesson notes

Firmware runs before the OS: it checks parts, trains memory, finds boot devices, and applies settings.

Why firmware matters

A board may physically fit a CPU but still need newer firmware to recognize it. Think of this like a guest list that needs an update before a new guest can enter.

  • BIOS or UEFI settings affect boot order.
  • Firmware updates can add CPU or memory support.
  • Debug LEDs can show where startup gets stuck.

Safe firmware habit

Before a CPU upgrade, check the board support page and firmware version. During a firmware update, follow the instructions carefully and do not interrupt the process.

Worked example

Inputs: CPU support list: model X requires firmware 2.10. Board sticker: 1.80.

Task: Identify the unresolved startup risk and safe pre-installation decision.

Check the reasoning

Socket fit alone is insufficient. Confirm a manufacturer-supported update/recovery path, or obtain a board already on a supported version.

Never flash speculative firmware. Use the exact board/revision file and vendor procedure with stable power; do not interrupt an active update.