Win10-64 installation driver problemn on J4205-ITX

Hello, I recently purchased a J4205-ITX to upgrade my actual Q1900-ITX + Win7-32 system.
The disk is a sata3 Sandisk SDSSDHP0645G SSD on SATA3_1 port (native , not AsMedia) and has been unpartitioned before installation process (Win7 image saved  with Reflect) .
I'm trying to perform a clean installation of Win10-64, using a usb stick (on a 2.0 port) with the .iso.
The stick has been created with rufus (mbr for bios or uefi-csm).
The board regularly boots and the installation process starts, but  I cannot get the os installed, cause after the "Install" window, a pop-up appears saying that (translated) "A media driver your computer needs is missing. This could be a DVD, USB or Hard disk driver. if you have a CD, DVD, or USB flash drive with the driver on it, please insert it now."
The missing driver is unspecified, though it seems to me that it's related to the disk.
Same behaviour if I use a sata2 hdd for the os or a burned dvd on a usb optical drive for the Win10 setup.
I've found no suitable driver on "Download" section on AsRock website, nor on Intel Download Center.

Exactly the same as described before if I try to install Win10-64 on the Q1900-ITX.

n.b. Win10-32 installs fine on both boards, so the problem seems related to 64bit version.

Any idea?
Thanks.