Request for help: how to pass the gauntlet on the 4th level of the trial of the sekhemas

I am blocked doing 4th level of the sekhemas because I cannot pass the gauntlet rooms due to being unable to open one door. I have already tried it several times but always find the same gauntlet on 4th level (I have tried avoiding doing gauntlets to bypass this, but I always come to a point where only a gauntlet room, is available, and it's always the same).
The gauntlet room starts with a square platform which has 2 rotating flamethrowers. After I pass the flamethrowers I come to a place where there is a blue/red lever in the middle and 4 doors. The exit is through a white door on the east, which is closed and looks like it can be opened with a lever behind the north door which features blue/green. There is a corridor on the left that is doing a loop between the south (blue) and the west (red) door. the red door is closed, the blue one open. On the loop between the 2 doors there's another door (green/blue) which is closed, and 2 levers, one in each section of the loop (a blue/green and a red/green). Behind the north door that needs to be opened, there are monsters blocked that can't be attained.
I go through the open south/blue door, move the blue/green lever which closes the blue door and opens the green/blue door, then move the red/green lever which closes the blue/green door but opens the red one. At that moment the 3 levers (green/blue, green/red, and red/blue is on blue) are activated - which should open the blue/green door but it does not...

Could somebody that has already gone through that gauntlet tell me what I'm doing wrong or what I should do?

I haven't found any solution on internet on such a subject... Thanks in advance for your help.