One of the confusing thing is the chipset for DW1830, according to WikiDevi archieved here, both BCM2045A0 and BCM20703A1 can be found in DW1830, but not in DW1820 @amthbt .
Previously, SysPrep indicates my DW1830's BT as BCM20703A1 after boot, but after wakeup claims to be BCM2045A0 under USB, which makes Airdrop not working anymore (yet BT mouse/handsoff works). I don't know whether this relates to firmware image injection...
Currently I swap back to DW1560, all issue solved.( BT lost after wake from sleep)
@pastrychef Agreed that audio and bluetooth don't appear to be related, but I have found that the use of AppleALC on my Latitude E6410 (Nvidia graphics) interferes with my Brcm combo Wi-Fi/Bluetooth operation. Specifically, with AppleALC, my laptop won't acquire Wi-Fi until a minute or two after booting. I switched to VoodooHDA and Wi-Fi works perfectly (no delay in acquiring Wi-Fi access point). I examined IORegistryExplorer to try to figure this out and noticed with AppleALC that Wi-Fi would connect only after I observed an AppleHDA event in IORegistryExplorer. I suspect that VoodooHDA "fixes" the problem when it installs AppleHDADisabler.
Long story short... I needed to use VoodooHDA and not AppleALC on my Latitude E6410 (Nvidia) running Catalina 10.15.3. My debug files are attached and my system is as listed below.
Laptop: Dell Latitude E6410 (Nvidia 3100m, 8GB DDR3, i7-620m)
OS: Catalina 10.15.3 (patched with DosDude patcher for Nvidia Legacy graphics acceleration)
Hi, I did follow the step in this thread, i manage to make my bluetooth work with correct firmware v14 c5862. the issue is, after i shutdown my computer. my firmware revert back to v14 c4096, which my firmware not loading properly. i compare the working log to non working the difference is BrcmPatchRAM: uploadFirmware could not open the device!. Any Advice out there. Thank you kindly.