The rules that are actually confirmed
A developer and the players in the “long code” thread agreed on three rules. There are no codes on these pads. The path starts on the same tile every attempt. Blank tiles connect in four directions, and you may not press two blank tiles in a row. Everything else is the shape of that particular maze.
The keypad drawing seven stars is a display, not a length limit. Players who stopped at seven presses were not done. The path ends when you walk off the edge of the keypad, not when the stars fill. Attempts reset on a new loop. One player watched the counter return to 100 after a reset.
What this page will not draw
Each late keypad has its own path, and no official diagram has been released. A traced solution I have not walked would be a guess. Use the three rules on the pad in front of you. If a guide offers a digit string for this puzzle, it is describing a different prompt — the Assembly elevator — or it is inventing one.
Show a stronger hint
If the pad rejects you at seven inputs, keep going. Leave through the edge. Do not press blank, blank.
Show the sourced solution
No digit string. Start on the fixed tile. Blanks are four-way and cannot be consecutive. Continue past the seven stars until the path exits the keypad. A new loop restores attempts.
Questions this page answers
What is the late keypad code in Echo Weaver?
There is no code. The developer and players confirmed the pads are mazes. Seven stars on the display is not a seven-input limit.