Soloeing TT 1-2 fail Oo

Skilledscuer - Heavens Tear

I was trying to solo 1-2 and i got passed the first two bosses within 1-1 area and when i got to the area for 1-2, the door was still locked. the stone in front of it says "You may proceed only if you have reached the difficulty level of Chronol or Dimensic in Squad mode"

Anyone know what means and how i can get rid of it that? Any help would be grateful

Malilizi - Harshlands

You have to run it in squad mode and you have to set the difficulty on high which will require an Ultimate Substance.

Linwiz - Lost City

Skilledscuer - Heavens Tear wrote: »

Squad mode

problem solved

Skilledscuer - Heavens Tear

So i cant solo 1-2 High mode? if i can , can i do with a Walker?