As of 2021.04 there are new drivers. It is unclear what has changed.

http://plex-net.co.jp/download/202104_PX-W3U4_Driver.zip

I think, but only think that these are the new numbers:

description target size crc32 align firmware_code firmware_segment firmware_partition firmware_crc32
PX-W3U4 BDA Ver202104 64bit it930x 216576 919235eb 4 00029fd0 0002bb40 0002bfd8 df0bf49a
^^ new
vv old
PX-W3U4 BDA Ver.1.4 64bit it930x 207232 a1e8223d 4 00029f50 0002bac0 0002bf58 df0bf49a

I have no idea what has changed.