Mitsubishi Electric MELSERVO-J4 Series Transition Handbook page 519

Part 7: Common Reference Material
(2) Changing the mode to "J3 compatibility mode" by using the application "MR-J4(W)-B mode selection".
You can switch the servo amplifier's mode to "J3 compatibility mode" beforehand with the built-in
application software "MR-J4(W)-B mode selection" of MR Configurator2. Use it for a solution when it is
difficult to reset many times with your "Reset required" controller such as "QD74MH_".
The application "MR-J4(W)-B mode selection" has no expiration date.
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Select "Change Mode".
Select "J3 Compatibility Mode".
Select "Operation Mode".