[werk_ag]

Any clues on what the issue maybe would be appreciated.

Hi,

The most probable cause for this issue is related to your RTC module. Maybe it is not a ZS-042 model.
The new software uses the eeprom installed on the RTC module, and some other RTC modules or have a different eeprom or at least it is located at a different address.

To discover what is happening, let's try some procedures:

First step: Check if your system can communicate with the flash memory.

- Download the latest software release (2015-06-21). In the folder utilities you will find a small sketch called FlashMemory_Test.
- Compile and upload it to your RX unit. Open the serial monitor window, and check if you get some output with info about the flash memory chip.
- If you get output from previous procedure, go to next step, if not, double check the soldering of the flash memory chip and it's orientation.

Second step:

- Also included in the utilities folder, there is another small sketch called I2C Scanner.
- Compile and upload it. Open the serial monitor window. You should get something like this:

Scanning...
I2C device found at address 0x27 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x77 !
done

If instead of 0x57, you get 0x56, please report back, then I will try to guide you to the next steps.