Hello. Sadly, I noticed the same thing when I bought the razer blackwidow v3 mini hyperspeed phantom edition and it didn’t work directly with the ps5 using the wireless dongle that came with the keyboard, but only through wired connection. HOWEVER, I found a workaround that makes this keyboard usable on ps5 over wifi. I also have the razer basilisk v3 pro mouse with its own wireless dongle and it works just fine over wifi with ps5. So I went into razer synapse and I paired both razer devices (mouse and keyboard) with the basilisk v3 pro wireless dongle. After that, I connected only this dongle in the ps5 and voila! I think you can try the same with your mouse deathadder v2 x hyperspeed.

You sir/ma’am are a scholar and a saint. You saved Amazon/Razer from a keyboard return. I purchased a Razer BlackWidow v3 mini hyperspeed edition to replace a full size logitech that had been destroyed, I swear it wasn’t me. Just as the OP said it didn’t work out of the box via Bluetooth or the USB dongle even after firmware check/update. I then purchased a Razer Orochi V2 Mobile Wireless. I updated the firmware on the mouse/mouse’s dongle. Then I pared the BWv3 mini with the OrichiV2 dongle. BOOM the keyboard and mouse now work on the PS5.

To Razer, if you’re listening. This is a silly problem. And you’re a silly company for allowing this. You’re a “gaming” accessories company; you should ASSume that your accessories will be plugged into gaming equipment. Extreame work arounds like this make you look very silly.

To luciyanmihai91, may you find fortune wherever you go. I will try to pay it forward.