Have you tried to check the firmware first if its compatible with your D3 it might be incompatible that is why it shows "cannot find Signature"
You must flash your miner with a correct firmware if you flash it with incompatible firmware it might brick your miner or it may cause more errors.
I suggest you to always use the firmware from bitmain for safety purposes.
I'm sure it's compatible because that firmware I had previously installed in the ASIC and I was mining with it for almost 3 months, only for maintenance issues I had to install the previous one and now when I try to reinstall the Blissz version, I get with this message