How to factory reset mpd18 - Akai Professional MPD18 Steven Slate FireWire Drum Package

Question edited for clarity.

Try a Factory Reset. Try a power reset first. Disconnect from the mains plug for 15 minutes.

System Reset - Yamaha PSR-S750 Service Manual

ManualsLib https://www.manualslib.com > ... > Service manual
There are two reset methods in the SYSTEM RESET display: Factory Reset and Custom Reset. ... This function lets you restore the status of the instrument to the ...

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  Yamaha PSR-S750 Reference Manual - System Reset

  https://www.manualslib.com > ... > Reference manual
  This function lets you restore the status of the instrument to the original factory settings. ... buttons to enter or remove the checkmark. ... operation for all ...
  
  

Question edited for make model (what it is)
Question moved from Cell Phones

Factory Reset, or Hard Reset doesn't clear ROMS

https://www.sweetwater.com/sweetcare/articles/perform-simple-hard-reset-factory-defaults-kurzweil-k2000-k2500/#:~:text=On%20the%20K2600%20or%20K2661,powered%20off%20and%20back%20on.

More here

https://www.google.com/search?q=kurzweil+k2600+reset+ROMS

and here

https://www.google.com/search?q=kurzweil+k2600+format+ROMS

..

It's possible to reset the DTXPRESS electronic drum kit to its factory default settings by performing a Factory Reset. Here's how you can do it:

Press and hold the [DRUM KIT] and [SAMPLE] buttons while turning on the power switch.
The display will show "FACTORY RESET OK?"
Press the [DRUM KIT] button to execute the factory reset.
The display will show "INITIALIZING" while the reset is being performed.
When the reset is complete, the display will show "COMPLETED".
Note: Performing a factory reset will delete all user kits, samples, and other custom settings that you have made. Be sure to save any custom kits or settings that you want to keep before performing the reset.

Power up while holding play-erase. BUT...when performing a re-initialization, this will erase all existing patterns, songs, and drum assignments. This will not erase the factory preset patterns or kits.

http://community.alesis.com/alesis/topics/sr-16-factory-default-reset-question

If you buy a second hand, it may have been damaged in mini switch (tact switch) under the WRITE button. You need to replace the tact switch. Easy and inexpensive, you can do yourself, only with a little knowledge of soldering
.

Tact Switch:
You may also try the FACTORY RESET.
Restoring the GT-10 to the settings made at the factory is referred to as a "Factory Reset."
Not only can you return all of the settings to the values in effect when the GT-10 was shipped from the factory, you can also specify the range of settings to be reset.

If you do this"Factory Reset", all the setting on user memory (that you create) will be erased, so backup your setting before doing this steps.

For more detail on "Factory Reset", read the GT10 user manual:
roland.com/support/article/?q=manuals&p=GT-10&id=1810803

To perform a factory reset on the Zoom R16 recorder, follow these steps:

1. Power off the Zoom R16 by pressing and holding the [STOP] button.
2. While holding down the [STOP] button, press and hold the [REWIND] button and the [PLAY] button.
3. Continue holding all three buttons for about 5 seconds until the display shows "Factory Reset."
4. Release all three buttons and the unit will automatically restart and restore all factory settings.

Note: Performing a factory reset will erase all user data and settings, so be sure to back up any important data before proceeding.

My A2 effect not work properly

You can restore the settings in the ME-25 (memories, tuner

reference pitch, and knob response method) to the values set when

the unit was shipped from the factory.

Performing a factory reset causes all settings saved in memory to be

lost. If you want to keep the memory settings, use the ME-25 Librarian

(p. 11) to save them on a computer.

1.

Hold down [EXIT] and press the MEMORY DOWN

pedal at the same time.

"FA" appears in the display.

2.

Press [WRITE].

The Tuning Guide flashes.

3.

Press [WRITE] again.

The display flashes and the factory reset is executed.
Never turn off the power while factory reset is in progress.