The naming convention bnx2-mips-09-6.2.1b.fw breaks down as:
For further assistance, consult the Debian Wiki page on bnx2 or the firmware-bnx2 package changelog. And before any major kernel upgrade, verify that the firmware-bnx2 package remains installed to avoid unexpected network loss after reboot. bnx2 bnx2-mips-09-6.2.1b.fw debian 11
This method assumes you have temporary internet access via another interface (e.g., a USB-to-Ethernet dongle, Wi-Fi, or a second working NIC). The naming convention bnx2-mips-09-6