Trying the 4.51 Beta, got it yet?

No.  Link still doesn't work. Will work soon, I hope

I was hoping others were able to get the beta while it's taking an unusual amount of time for this to become available for me. I agree

You can find the firmware here:

https://www8.garmin.com/support/download_details.jsp?id=14527#Instruct

I've flash my intinct today, so, it' too late to say something;

I just installed the beta and will also see.... thanks for posting the link!

Hello,
After a short week of use, I do not notice any significant improvement.
On the other hand, I notice a drift of my GPS track (tested on 8 routes), both in GPS, as well as in GPS+Glonass or GPS+Galileo, and with a recording every second.
Is it really related to the update?
I don't know!
On the other hand, the sky is blue and on the routes taken, the tracks were less messy before

If you see a regression compared to previous versions, please contact the beta team via email and provide them details.

Okay, but I don't know how.....

There are instructions on the beta download page (at the top, it's the notes).