Mchose V9 Dongle not recognized

Hi everyone, I have a V9 headset and I tried updating the firmware, so I had to turn on the headset and change the modes to English. I found a Russian video showing it and tried it, but I left the dongle connected, and now it stopped working with the 2.4 GHz dongle.

I've read some articles and it seems that if you have the original firmware, you can revert it. Can anyone with a V9 provide the original firmware?