The latest versions of Tableau Firmware Update (TFU):

UltraBay / UltraBlock / TX1 (v25.4) - https://digitalintelligence.com/files/setup_tableau_firmware_update_25.4.msi

TX1 pkg (v25.4) - https://digitalintelligence.com/files/tx1-firmware-25.4.0.4-88a1b69b1c.tx1_pkg

TX2 pkg (v25.2) - https://digitalintelligence.com/files/tx2-firmware-25.2.0.28-cb5febd709.tx2_pkg

TD4 pkg (v24.3) - https://digitalintelligence.com/files/td4-firmware-24.3.td4_pkg