What level allows 6-star rankups?

TyEdge

Absent the sigil, of course. I have a level 43.5 mini that just hit uncollected. I can’t rank up my one and only 6-star because I can only carry 6 t4cc. When does it switch over?

Scarcity27

Probably level 50 to r2 and 60 to r3. Without sigil of course