kRO Grade changes

Ungraded -> Grade D
Equipment at the refine rate of +9 can now be graded.
Chance: 20%, cost unchanged.

Equipment at the refine rate of +10 can now be graded.
Chance: 30%, cost unchanged.

Grade D -> Grade C
Equipment at the refine rate of +10 can now be graded.
Chance: 30%, cost unchanged.

Hello,

are there any offical Patch notes or stuff? We didnt found any information about this changes.

any news/thoughts on this?