C120 and DSM 30 software downloads

[Hydra Sport 25]

OK so this is the situation; I have a C120 MFD that I have recently downloaded the v5.16 operating system into.(seems to work fine). I noticed there is also an upgrade to the DSM-30 operating system v4.20 and v518 bootloader. This download consists of : DSM300-V518-C, DSM300-V4-20, and a autorun file that I have copied to a flash disk. According to a previous post, I have also installed autorun 00 sh sig and autorun 00 sh on the same flash card.
Should I attempt to download this into my system? I have read somewhere that I may have to power down the DSM30 during this process. I don’t have control to do that, it is installed in behind my MFD in the dash counsel of the boat.
1. Should I delete the original autorun file on the card?.
2. Should I just leave well enough alone and not try to download it?
One other question; My transducer is a Airmar 31-092-7-01 (E66014) Should I be getting water temperature from it? I’m not now.