FYI that i just found. see this article from the TrueNAS forum site that has a non-public 16.00.12.00 firmware for the 9300-16i.
Page Link: https://www.truenas.com/community/threads/lsi-9300-xx-firmware-update.85768/
SAS 9300-16i Firmware 16.00.12.00
Download Link: https://www.truenas.com/community/resources/lsi-9300-xx-firmware-update.145/download
Also i setup a temp system with windows on it and loaded the Broadcom LSI Authority app on it. it makes identifying and updating firmware really easy!! (note that LSA is the replacement for the MegaRAID Software)
This is the latest version that i could find (ignore that it says for RAID)
Page Link: https://datacentersupport.lenovo.com/us/en/downloads/ds559924-lenovo-storage-devices-raid-adapter-windows-utility
LSA version = 008.002.017.000
download link: https://download.lenovo.com/servers/mig/2022/12/09/56543/lnvgy_utl_raid_mr3.lsa-202208260254-0041_windows_indiv.zip