Bowers & Wilkens A7: 'hangs' with pulsing red LED

Situation

When the A7 is powered on, the LED starts slowly pulsing Red (Start-up mode). This does not change. Sometimes after at least 30 min., the LED starts pulsing in red more quickly.

Checks/tests

1.     A7 in on modus (slowly fading red LED) > reset button hold for 10 sec’s.

• Result: the red LED turns off, nothings happens, no A7 visible in the WiFi network.

2.     A7 in off modus (red LED off/or standby?) > reset button hold for another 10 sec’s.

• Result: during the holding of the reset button, the LED quickly flashes yellow. When releasing the reset button, the red LED keeps flashing quickly (forever). Nothings happens, no A7 visible in the WiFi network.

3.     A7 switched on and wait for long time.

• Result: red LED flashes/pulses quickly, without ability to connect.

4.     A7 with quickly pulsating red LED, pressed and held the reset button for 10 sec’s.

• Result: the LED turns purple (constantly on). After releasing the red LED after 10 sec’s, the LED changed back to quickly pulsating red. No ability to connect.

5.     While press & hold the A7 power button, put in the C7 power cable. This is to force the device to get into firmware update mode. After that I connected the USB cable to the iMac.

• Result: the A7 LED turns (fixed) white. After connecting the USB cable to the iMac, the LED changes from fixed white to quickly flashing white. No ability to connect.

6.     Turn the A7 on, wait until the Red LED slowly faints on and off. Than press and hold the reset button for appr. 2 sec’s until the red LED flashes 2x.

• Result: the LED turns off, then after appr. 1 minute it started quickly flashing Red.

Questions

1. Is there any way to force-update the firmware?
2. Are there any (which) components broken, that need replacement?
3. Any other suggestions?