FIXED! Old OVMS stopped working :(

From the manual:

The OVMS module has two LED lights. When the OVMS module is connected to the car, it will go through a start-up sequence, which is reported through its LED lights as follows:

1. A)  The RED light will come on solid and the green light will blink the module’s firmware version as a set of 3 sequences, each separated by a pause. For example, 1.2.7 will be 1 blink then a pause, then 2 blinks then a pause, then 7 blinks)

2. B)  The GREEN light will blink out a countdown of the boot-up sequence, as follows:

   10 – Waking up the modem
   9 – Checking for presence of SIM card
   8 – Checking SIM card and lack of PIN lock
   7 – Initializing the modem
   6 – COPS initialization (trying to connect to a cellular tower) 5 – GPRS Network initialization
   4 – GPRS APN is OK (Initialization complete)
   3 – GPRS Network call is made
   2 – GSM is Ready
   1 – GPRS is Ready

   Since GPRS has not yet been configured, the first sequence will end with 2 blinks.

C) Should an error occur, the RED light will blink out an error code, as follows:

1 – Lost signal
2 – Cannot communicate with modem
3 – SIM card is missing, not inserted properly, or not detected 4 – SIM card has a PIN lock
6 – COPS GSM lock could not be obtained
7 – Error during GPRS initialization (might be temp related)
8 – GPRS Network initialization failed

Note that in case of an error, the Green light will still be blinking its state concurrently with the Red light blinking out its code. For instance, if the SIM card has a PIN lock the Green light may be blinking 8 times while the Red light may be blinking 4 times. This will look like both Red and Green blinking 4, following by Red blinking another 4 (to make 8). You may want to hide light with your finger to help you count properly.

From your description, it sounds like the communications between MCU and modem has some problem. Do you still have a 2G cellular network in your area?