A number of my LEA-M8T modules are running older firmware (2.3) than the latest available (3.01). The process for updating them is not difficult, but some aspects are not intuitive and instructions may be difficult to find.

• https://junipersys.com/data/support/mesa-2-ublox-gnss-firmware-update.pdf
• https://www.eevblog.com/forum/metrology/u-blox-m8t-firmware-fw-3-01-tim-1-10/

• ubx_m8_301_tim_110.9a999e9cf84f0b3a0a7ed0146d20e5cc.zip - Unzip, save as .bin file
• u-blox M8 Flash Firmware 3.01 TIM 1.10 Release Notes