BSCU channel fault A320

[WhiteKnight]

Hello,

for a BSCU channel fault in an A320, there is a reset procedure in the QRH which says:

In Flight:

Before landing gear extension:
‐ Set A/SKID & N/W STRG sw to OFF
‐ Set A/SKID & N/W STRG sw to ON ‐
If required, rearm the autobrake
When landing gear is down: reset not authorized

Does anybody know, why we shouldn't do the reset with the landing gear down, and what can happen if we do it anyway?

thanks for any inputs!!