UPDATE 2 Nov 2023: Check out the article...
Reply to Ox64 Notes by TL...
"I was able to start communicate with BL808.
When testing, please, use CH340C/G, as FT323RL doesn't work, even on slow baudrates.
Also, be sure that your CH340C/G dongle is working, as I already yesterday tried CH340G dongle, but it didn't worked (but I had feeling that it's broken). After using another one, it works perfectly!
Also, start with 115200 baudrate, and then move to 2000000
About USB, it's probably disabled in eFuse, so there is bit in eFuse, with which we can enable USB port for BootROM."