Kathrein Twin-PVR Satellite UFS 821si - Manual (Page 40)

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Use the

buttons (On/Off) to choose whether use of the receiver
should be protected by a four-digit PIN. When switching the unit on
from Standby you are then prompted to enter the PIN. If the PIN is not
entered the receiver cannot be operated.
Receiver Lock
User Preference
Use the

buttons to select the age rating to watch TV programmes.
The minimum age rating you can set is “under 4”, and the maximum
“under 18”. Each press of the

buttons increases or reduces the
age rating by 2 years. The programmes concerned can then only be
viewed by entering the PIN.
This lock is only effective if the necessary locking signals are
transmitted.
Age Rating Control
Use the

buttons (On/Off) to select whether settings/changes on
the STB Management menu (a sub-menu of the System Setup menu)
may be made without entering the PIN or not.
STB (Receiver) Management Lock
Press  to replace the old PIN with a new one. Enter the new
(four-digit) PIN. On the screen which then appears use the 
buttons to select “OK” and confirm the changed PIN by pressing

.
Keep your password in a safe place, so that you always have
access to your channels should you ever forget it.
If you have forgotten your password, you must contact your dealer,
who will be able to unlock your receiver for you.
Change PIN