I can`t erase any of my recordings.

If erased, GONE. If you press the "Play" button, wait for the unit to say, No messages, then press it again. If nothing is played, it's gone. If it's still there, call your phone with your cell phone, access your answering device, follow the above procedures, and press the record button on your cell phone. Then send it to your e-mail for a hard copy. Good luck.

I'm not sure about that particular model, but usually you can press ERASE as the message is playing.
On some other models you have to press ERASE at the end of the message you wish to erase.

In either case, right after you press ERASE it will ask ERASE? (or FILE ERASE? ) then you press ERASE again.

Just make sure to experiment a bit so you don't erase a wrong and important recording by mistake.
I don't believe it can be recovered.

Hello you can erase the recorded messages one by one or all massages in folder at time

Note once a recording has been erased, you cannot retrieve it.

Erasing messages one by one

1 Press ERASE while playing back the massage you want to erase or press ERASE for more than 1 second during stop mode.

A beep will sound and the message number and "ERASE" will flash while the first and last 5 seconds of message is played back 10 times

2 Press ERASE while the message is being played back.

The message is erase and the remaining messages will be renumbered. (For example, if you erase Message 3. When erasing is completed, the unit will stop at beginning of the following message.)

Erasing all messages in a folder

1 Press FOLDER to select the folder you want to erase.

2 While pressing STOP, press ERASE for more than 1 second.

"ALL ERASE" will flash for 10 seconds

While the display is flashing, press ERASE.

Greeting message
When the unit answers a call, callers are
greeted by a greeting message. You can
record your own greeting message or
use a pre-recorded greeting message.
Recording your greeting
message
You can record your own greeting
message (2 minutes max.).
1 {GREETING REC}
2 Within 10 seconds, press
{GREETING REC} again.
3 After the base unit beeps, speak
clearly about 20 cm (8 inches) away
from the MIC.
4 Press {?} (STOP) to stop recording.
Using a pre-recorded greeting
message
If you erase or do not record your own
greeting message, the unit plays a prerecorded
greeting message for callers
and asks them to leave messages. If the
message recording time (page 39) is set
to “Greeting only”, caller messages
are not recorded and the unit plays a
different pre-recorded greeting message
asking callers to call again.
Playing back the greeting
message
Press {GREETING CHECK}.
Erasing your greeting
message
If you erase your own greeting message,
the unit plays a pre-recorded greeting
message for callers.
Press {GREETING CHECK}, and then
press {ERASE} while your greeting
message is playing.
Listening to messages
using the base unit
When new messages have been
recorded, the message indicator on the
base unit flashes.
Press {6}.
L If new messages have been recorded,
the base unit plays back new
messages.
L If there are no new messages, the
base unit plays back all messages.
Operating the answering
system
Key Operation
{^} or {V} Adjust the speaker
volume
{7} Repeat message
(during playback)*1
{8} Skip message
(during playback)
{?}
(STOP)
Pause message
– To resume playback,
press {6}.
– To stop playback
completely, press
{?} (STOP) again.
{ERASE} Erase currently playing
message
*1 If pressed within the first 5 seconds of
a message, the previous message is
played.

check if this works and tell me if any issues

How to Record:
1. Make sure HOLD switch (on side of unit with pocket clip) is set to off position (slide to right is off - to left would be hold)
2. For best results set unit with mic(rophone) which is on top of unit toward sound source and press REC/STOP button (Top button on front of unit just below LCD display). Recording will begin and will be indicated on LCD display.
> Red Record LED will be on and the message number, recording time will be displayed on the LCD.
3. To stop recording, press REC/STOP button one time.
* If no other buttons are pressed within 1 minute at stop position, it will power off automatically.
4. Pause during recording by simply pressing MODE/PAUSE button- press button again to resume.

There is a Voice Operated System (VOS) Recording button on left side also. You can record with voice activation to conserve recording space but I have found that you lose a portion of the recorded sound as it activates and if there is no sound for a very few minutes the unit powers off and you will get nothing further recorded. I recomend just keeping VOS in off position.

5. To erase a recording: Select the message number you want to erase and while it is stopped (the message number will appear in LCD with the length of recording showing also)
Press and hold the ERASE button until the LCD begins blinking "ERASE" then, while it's blinking simply press the erase button again and the recording will be erased.

6. To play back a recorded message find your message by "toggling" the switch on the right side of the unit that says INDEX. That switch is the fast forward/reverse play etc. To Play simply push the switch in. This button/switch takes a little practice to use but the Play portion is straight forward. Use the front buttons to pause and stop during playback.

Hope this helps.

I read thru the manual. There is nothing bout recovery of factory messages. If you recorded your own, try deleting it. Or unplug the base from power and try a reset. This is from the manual. At the end, I gave you a link to the manual!

Using a pre-recorded greeting
message
If you erase or do not record your own
greeting message, the unit plays a prerecorded
greeting message for callers
and asks them to leave messages. If the
message recording time (page 39) is set
to “Greeting only”, caller messages
are not recorded and the unit plays a
different pre-recorded greeting message
asking callers to call again.


http://service.us.panasonic.com/OPERMANPDF/KXTG9331.PDF

The erase button is on the right hand side of the recorder. When you are on the message that you want to delete, then hold the erase button down. The message will start to play and an erase message will flash. Push the erase button down again and it will delete the message. Continue to do this for each message until you have the desireable amount of free space.

The ERR message can only be corrected by holding in the DISP/MENU and STOP buttons for two seconds, which results in all the material on the recorder being erased. It will say (FOR) for a few minutes while it is erasing everything, then will work again. Solution found at http://www.amazon.co.uk/Olympus-VN-2100-Digital-Recorder-microphone/dp/B000V3NTEU

find the recording you want
press the erase button (front of the recorder(top left))
after pressing it let it go
then press it again
that recording is then gone
voila

TRY USING A DVD LASER LENS CLEANER