Well, i bought today my Wii U with the hope to get one with the Firmware of 5.3.2 but ofc i did not.
For Safety, i blocked the updates:
nus.c.shop.nintendowifi.net
nus.cdn.c.shop.nintendowifi.net
nus.cdn.shop.wii.com
nus.cdn.wup.shop.nintendo.net
nus.wup.shop.nintendo.net...