A problem can occur that results in the module being unable to power up correctly. This is related to the RTC and only affects modules with a battery (or external VBATT supply).
If a battery is attached and power down occurs when a Real Time Clock interrupt is pending, the outstanding interrupt is retained in battery backed RAM. When re-powering the module, the pending RTC interrupt is triggered before initialisation of the RTC registers causing a lock up.
The solution was to add code to clear any pending RTC interrupts during initialisation.
Fixed in boot.bin V00.24 nandboot.bin V00.30
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