On Friday afternoon, I had successfully installed and configured the DB1 with the original 190304 firmware and configured BI to use the RTSP stream.
On Friday night, after reading the 101 guide, and last few pages on this thread, I decided I wanted to upgrade to the HikVision F/W to get the ONVIF to use with OpenHab and BI, so I followed
@alexdelprete f/w upgrade guide, and I permenantly bricked my EZVIZ DB1 trying to upgrade from the original EZVIZ F/W 5.2.4 190304 directly to HikVision F/W 200321 using Batch Config 3.0.3.8. The DB1 is now stuck with constant red ring; no flickering of the red ring when pressing the reset button. No AP broadcasting. I disconnected the DB1 wires to the transformer overnight, and then tried the Skinah's recovery steps with no luck. I also tried installing a memory card with the HikVision F/W 200321 renamed as digicap.dav and that didn't work. I tried various 30-30-30, 60-60-60 reset power cycles (similar to the old DD-WRT steps), while holding combinations of the reset button and db button down with no luck either.
On Saturday, I went and bought another DB1. This time I upgraded the F/W using the EZVIZ app to the current version it indicated, which was 191211, and I have it configured in BI to use the RTSP stream.
I spent all Sunday reading from pg 69 (original 101) all the way to the end (pg 239). There were were I think two whole posts buried in those 170 pages that indicated to update EZVIZ FW to 191211 first before upgrading to HikVision. The 101 warns not to update to current RCA FW versions, and upgrade directly to current version of Laview, Nelly or HikVision FW, but there were no warning about FW version paths for DB1's. A few posts indicated problems using Batch Config 3.0.3.8 and to use 3.0.2.6 (but there was no link to where to get the older version), so I don't know if the FW upgrade crashed using newer BC version. I managed to find a copy of the older BC version 3.0.2.6 on Nelly's site. I confirmed the SHA1 for my HikVision FW 200321 file matched what someone (I think it may have been alexdelprete) posted in one message in this thread. I really suggest adding the SHA256 checksums for all the firmware and tool version files to the 101.
While you can use powershell scripts, I use the CertUtil.exe file that is already a part of Win10 to generate SHA256 checksums. syntax is "Certutil -hashfile <filename> SHA256"
Tomorrow, I will try again to upgrade my replacement DB1 from EZVIZ FW 191211 to HikVision FW 200321 using Batch Config 3.0.2.6.