For example, if you have a ThinkPad X1 Carbon Gen 9, search: ”ThinkPad X1 Carbon Gen 9 Thunderbolt Retimer Firmware 60044” .
For the purpose of this article, we focus primarily on the USB-C/Thunderbolt retimer firmware—the most common source of "60044" firmware queries on Lenovo forums. Lenovo 60044 Firmware
Official sources:
B6000_A442_60044_001026_141030_WW_3G (3G/Mobile data model). For example, if you have a ThinkPad X1