Okay, here's the longer step-by-step version for clarity.
I flashed 5.25, from the link your provided, do an 8-gig flash drive Etcher.
When I run it off the flash drive while Batocera 5.24 is installed to the laptop, it cannot recognize my Bluetooth controller or network connections, making it impossible for me to test anything.
I overwrote my Batocera 5.24 installation with Ubuntu to see if that made a difference. Running Batocera 5.25 off the flash drive under this setup does get it recognizing the network and the Bluetooth, but it won't remember my Bluetooth gamepad under this setup(which I actually expected).
If I then tell Batocera 5.25 to install to disk -the laptop's internal hard drive- the version it installs is ALWAYS 5.24. I've tried this three times now - it just will not install 5.25.
I know it's weird, but I hope that cleared it up.
EDIT: I just noticed at your link that there's a newer build of 5.25 up than the one I tried(I was trying one dated 2020/01/18, and I see the one up now is dated 2020/01/24), I will give the new version a try to cover all bases.
EDIT 2: Same thing. Installs 5.24 2019/11/05 build instead of 5.25.