I had the same issue. What I found after going through tons of threads and troubleshooting is other USB 3.0 devices/cables interfering the signal. I used the extension cable that came with the headset and placed the dongle away from CPU and other USB cables and it worked.

https://mysupport.razer.com/app/answers/detail/a_id/5550

I tried everything that has ever been recommended. Nothing worked.
I bought the headset 2 days before, got it today. installed synaps and everything worked. tried to do the firmware update now its stuck and not even showing up in synaps. spended 200Eur on it. Pls help.

I tried everything that has ever been recommended. Nothing worked.
I bought the headset 2 days before, got it today. installed synaps and everything worked. tried to do the firmware update now its stuck and not even showing up in synaps. spended 200Eur on it. Pls help.

 

Okay tried to do it with using the extension cable and now it worked thanks to: @loggereye 

This workaround solved the issue for me. Million thanks!

Simple solution (when I had the same problem):

• Update firmware, but before you start the updater, unplug dongle and turn off headset to avoid error described above.. and then run updater and follow the guide (plug dongle then turn on headset) 
• Run Synapse as Administrator then the device will be detected by Synapse as expected
• Optionaly edit Synapse shortcut Properties>Shortcut>Advanced>Run as administrator

Hypothetical explanation: Sometimes it depends on security settings of Windows profile, programs don’t have permission to handle some or some specific types USB devices when they are started by user with low privileges.

Let me know if it works.

This worked for me, thanks!

@EazyPeeler Thanks for info thats worked for me Perfekt

nothing listed here fixed the issue for me :(

Same here. The app is not working at all.

Thank you so much. this worked. I’ve been troubleshooting all day, no progress. I was at the store to buy a new headset when I found your post. 
 

Thank you a million times.

I tell you that today, 07/08/2024, my RAZER BLACKSHARK V2 PRO (2023) arrived and I didn't want to use Synapse 3, although my Viper 2 mouse was connected. I tried all the steps that have been mentioned in this post and NOTHING, until It occurred to me to install the other version of synapse called ´´THE NEW RAZER SYNAPSE´´, I followed the steps exactly as they appear on the page and it worked for me.

note: I was about to return the headphones until I tried that method, I leave you the link (you have to uninstall synapse 3 before installing the new version)

How to install or upgrade Razer Synapse

Recently I bought Razer Blackshark V2 Pro (2023) - White Edition but Synapse does not recognize it and I am unable to use 7.1 and other settings.

 

When I open Synapse, razer central shows me a new update like below.

 

 

But when I click update, it fails

 

 

Here is what I tried ;

Repair Synapse

Modify Synapse

Uninstall, Install Synapse 3.0 (Used clear re-installation guide - https://mysupport.razer.com/app/answers/detail/a_id/1708 )

Try to update from Razer central,

Add an exception to firewall,

Disabling firewall (I dont have any antivirus program)

Update Windows,

Run as an Administrator

Install DOT.net framework

Closing background razer programs

Removing devices from Device Manager (Including HID ones)

Installing previous Synapse versions 

Tried every USB slot in the PC, even Base Station V2’s USB slots also.

I also tried to download Cortex and install the Synapse from there.

 

But everything failed. Headphone works normally, there is no sound issue etc. but synapse does not detects it.

 

I hope you guys give me a solution for it.

 

Thanks in advance

My friend, did you finally manage to solve the problem with your Razer Blackshark V2 Pro (2023)?

This post helped me a lot!!

Just got this headset today and can’t believe this is still an issue….

Try new Synapse (beta), testing it since long time, no detection problems: https://www.razer.com/synapse-new

Yeh I’ve uninstalled and re-installed this half a dozen times, followed all of the different suggestions in these forums, watched youtube videos, and still it does not want to be detected

My headset was being detected from the moment I turned it on and installed the Synapse Software that came with the dongle I plugged. For some reason however today I noticed it wasn’t recognized anymore and absent from the dashboard.

What I had done was plugging it with the usb cable (without the extension), on a slot next to the plugged dongle, and I guess maybe that’s what caused the issue. I haven’t tried adding the cable extension though.

I tried a few things which didn’t work, I was very frustrated because it wasn’t detected in Synapse (and yet it still worked), which I found very annoying because I wanted to see the battery level.

Anyway, after reading this thread, I installed the latest firmware, followed the instructions (I made the mistake of letting the dongle plugged and the headset on though, which could have messed the process as it did with some other folks apparently but it worked for me anyway so I got lucky). I now see my headset back on the dashboard and I just documented it here because that might give some hindsight for people having the same kind of trouble in the future.

Good luck to the customers falling upon this.

To the support team : this is not an “isolated” edge case. I’m glad I didn’t receive that kind of stupid answer from you because that would have driven me nuts.
Do proper testing for your software. The product is >200€.