This is shared SEALMINER SEALMINER reference material covering 3 models. Components, supply voltage/phase, PSU, cooling and service procedures vary by model and revision. Use the exact model nameplate and OEM manual; shared examples do not establish compatibility.
Firmware is how you upgrade, recover, and optimize a fleet. Stock keeps units on spec; custom firmware (Braiins OS+, Vnish, LuxOS) adds per-chip auto-tuning for better efficiency - at a small dev fee and a voided warranty.
Upgrade via the vendor's tool/web UI with the exact-model image. Note: ePIC's UMC firmware can REPLACE stock on Antminer/Whatsminer (and some others) with a ~1.5% dev fee - so a unit you meet may be running ePIC, not stock.