Success updating the 3008 to IT mode. [edit: after I updated to phase 6 IT, I realized the driver is phase 5, so I downgraded.]
Steps:
0. Find the SAS ID (I found mine on a sticker on the motherboard (starts with SAS: 50003048) - write down the last nine characters.
1. Download the 3008_FW_PH5_070214.zip file and extract the IT folder to a USB drive
1.1 - ftp://ftp.supermicro.com/driver/SAS/LSI/3008/Firmware/
2. Insert USB drive into server and power on
3. Press F11 to choose boot menu
4. Boot into EFI Shell
5. change to the USB device (type 'fs0: or type 'map' for a listing)
6. cd to IT/UEFI folder
7. run 'SMC3000T'
8. when prompted, enter the 9 characters from step 0. It's a quick timeout, and I finally tried lowercase hex which worked (the first couple attempts failed).