Help cant get back inside mountain

[Greta1212]

ive finished the main game but while going back trying to find all the EPs and the challenge i couldnt get back inside the mountain

im stuck on the blue yellow puzzle but ive connected the yellow one to the door but since im coming back from outside im stuck on the blue side

does anyone know how to get myself unstuck or some other way to get back into the mountain without reloading an old save (and loosing a lot of progress)

[Hairy Phil]

1) You can't strand yourself permanently on that puzzle. Play with both sides a little more and you will find a configuration that works. But...
2) Since the light bridge isn't already in the correct configuration, that means that you must have exited the mountain via a different route. Try to remember where you came out.

[Greta1212]

i have managed to get myself stuck inside once again
i got myself back inside through the challenge location and then through those caves but have now proceeded to lock myself in the final chamber/at the base of the mountain before entering the glass elevator. since the door was one way and i left my blue yellow puzzle unsolved i cant backtrack out

i think its actually over i probably have to reload a save

[Hairy Phil]

I see. That cave door is not one-way. Reopen it by re-solving the triangle puzzle on the floor.