Do not cross-flash. A Dell DSL2520UZ2 has different I2C addresses for SGPIO (LEDs) than a Supermicro version. Flashing the wrong vendor's firmware will not brick the chip but will cause the PHYs to "rail" (stay open), generating massive heat. Compare the MD5 checksum before flashing.
SAS expanders are sensitive to voltage droop. If your drives are reading/writing during a flash, the 12V rail sags, and the expander undervolts during the write cycle. This corrupts the firmware 100% of the time. Always flash from a maintenance OS or bootable USB with zero disk I/O. dsl2520uz2 firmware hot
Under standard operation (room temperature, 200 CFM chassis airflow), the DSL2520UZ2 runs at 55°C–75°C. It is designed to accept temperatures up to 95°C at the junction. If you feel the heatsink and it is "warm," that is normal. If it is "hot" enough to desolder itself or burn your finger instantly (exceeding 85°C on the package), you have a problem. Do not cross-flash
The stock thermal pad on many backplanes is garbage (0.5 W/mK). Upgrade to a Fujipoly or Thermal Grizzly pad (11 W/mK) between the DSL2520UZ2 die and the heatsink. This reduces peak temps by 12-15°C, giving you a buffer during firmware updates. The stock thermal pad on many backplanes is garbage (0
Before you proceed with the firmware update, ensure you:
The phrase "dsl2520uz2 firmware hot" is a direct cause-and-effect chain. Let’s break down why the firmware update process—or a bad firmware revision—increases temperature.