Assa Abloy Arrow Revolution U4A-YRHCPZW0 Installation And Programming Instructions page 17

To reset the lock to factory default, see the following:
Reset Lock to Factory Default
The following procedure returns the lock to its factory defaults
by deleting all user codes (including the Master PIN code*) and
returning all programming features to their original factory default
settings (see table below).
1. Remove the batteries and then remove the interior escutcheon
to access the reset button.
2. The reset button (see image at right) is located above the
PCB cable connector.
3. Hold down the reset button for a minimum of 3 seconds and
then reinstall the batteries; once the batteries are properly
installed, release the reset button.
All features, (see below) should now be returned to factory default.
*Upon reset (and initialization) of the lock, Master PIN Code
Registration is the only option available and must be
performed prior to any other programming of the lock.
See "Operation" section in this manual for programming instructions.
Factory Default Settings
Settings
Master PIN Code
Automatic Re-lock
Inside Indicator Light
One Touch Locking
Volume Setting
Automatic Re-lock Time
Wrong Code Entry Limit
Shutdown Time
See this section for programming instructions.
Factory Default
Registration required
Disabled
Disabled (Off)
Enabled
Enabled (Low)
30 Seconds
5 Times
60 Seconds
Reset Button
Interior Escutcheon
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P/N LT-503200 Rev B