Bro, I have the same issue. How have you solved it?
You will find the answer to your question in my review on AMAZON of the HiBy W3. Here, it is:
5.0 out of 5 stars
WARNING! Plug in your earphones before pairing it to your source.
Reviewed in the United States on November 6, 2020
Verified Purchase
I had pairing issues with my HiBy W3 just like others did. The problem with my unit was that the time windows (after holding the power button for several seconds) are short between just powering on, getting into pairing mode, and turning the unit off. Since it is logical to see a light telling you in which of those 3 modes the unit is at a given moment, I didn't put my earphones on while trying to get into pairing mode. And I tried many times to no avail. Once I turned my HiBy W3 with earphones on, I found out that the unit is programmed with a voice that tells you which mode the unit is in, and that made the difference that I needed to keep the power button pressed for long enough to get into pairing mode, but not for too long to end up powering the unit off. Once I got it into pairing mode, pairing was quick and easy and there haven't been any connection issues after my HiBy W3 got succesfully paired with several sources. Connection has worked exactly as it should, with the HiBy W3 being able to connect with 2 sources at the same time.
The HiBy W3 instructions say that a status voice notification is programmed into the HiBy W3. What is not said in the instructions is that the time window between power on, pairing, and power off stages is quite short and it could easily become very hard not to skip the pairing mode if you are not listening to the status voice notification.
The sound quality of the HiBy W3 is very good. The sound is more transparent than the FiiO BTR3. The FiiO BTR3 has more bass at the expense of being less transparent than the HiBy W3. Still FiiO BTR3's transparency is good and it is good to have both the HiBy W3 and the FiiO BTR3 for a change in sound profile when choosing between them as wireless receivers.
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