I have a 5 channel Minitor VI, just purchased (as a refurbished unit) from a vendor we've bought from before.
Originally, when I got it, it gave me the "unprogrammed" long tone.
I first upgraded its firmware to 1.06, then pushed our standard codeplug to it.
It accepted both the codeplug and custom audio.
After it reset, its been constantly blinking the front red light, and beeping a low frequency tone about 2 times per second.
Have you tried a known good battery in the unit? Flashing red is supposed to be the Low Battery indicator.
Is the tone constant or just just few beeps every once in a while?
It might be stuck in test mode. Here's what I have on that:
Test Mode
1. Rotate the Function Switch to position D.
2. Press and hold the Reset Button while powering on the unit.
3. An audible alert and red LED will indicate that you have entered to the I/O Test Mode. Release the Reset Button.
4. Press the Reset Button, the red LED turns off and the amber LED turns on.
5. Press the Reset Button, the amber LED turns off and the Battery Indicator LED turns on red.
6. Press the Reset Button, the Battery Indicator LED turns green.
7. Press the Reset Button, all LEDs turn on, the Battery Indicator LED is amber.
8. Press the Reset Button, all LEDs turn off and unit enters Pulsed Vibrate Mode.
9. Press the Reset Button, the unit enters Constant Vibrate Mode.
10. Press the Reset Button, a high pitched tone is heard.
11. Press the Reset Button, a louder high pitched tone is heard.
12. Press the Reset Button, a high pitch tone is heard and unit enters Constant Vibrate Mode.
13. Press the Reset Button, the unit enters Open Squelch Mode.
14. To exit Test Mode, power off the unit.