If you dont insert a gc then SX OS will prevent card fw updates. If you insert a gc it fallbacks to original behavior which is to update the gc asic if needed.
Also seems it only does this with a legit license. If you dont have a license it will fallback again
this is very helpful info not posted anywehre on gba temp or reddit, thank you for your post!!
sx os users, update away dont stress over nogc kip!!!!!!!