VM40C Firmware Versions
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00x.001 
- first version

00x.002
- SMS polling bug (sometimes "SMS error" shown)

00x.003
- self re-triggering relay alerts in very sensitive modes fixed
- SMS battery alert threshold below charging threshold (no battery alert with charger)

00x.004
- not delivered

00x.005
- in SN 640312a max. value of vector sum instead of X saved
- very small values are not zeroed anymore
- issues in memory menu

00x.006
- change in init. menu, not relevant for user

00x.007
- support of ver. 3 hardware
- support for worldwide modem Telic ME910C1
- SMS polling by sending an SMS to the VM40
- display of "Battery empty" at low power shutdown
- cloud dialog (not enabled)

00x.008
- timeout bug in record name menu fixed

00x.009
- Charging restarts when battery voltage drops below limit during measurement
- Events "CH1" and "CH0" are recorded at beginnung and end of charging
- SMS bugs removed
- Warning for large records at intervals <60 s added
- Watchdog for restart when program hangs
- French/Italian as a seprate firmware file
- PIN input bug fixed

00x.010
- SD card init bug fixed
- Wait time for modem detection reduced

00x.011
- Improved main frequency measurement
- Bug in 315 Hz bandwidth mode fixed

00x.012
- Support for IoT platforms ThingSpeak and AskSensors
- Modem is only switched on when needed, longer battery life 
- SMS polling by calling the device removed

00x.013
- Support for LoRa radio controlled beacon (VM40-R)

00x.014
- Bug after unlocking keys fixed

00x.015
- Warning at shutdown when VM40-R1 connected (battery drain)

00x.016
- APN menu supports "." 

00x.017
- changes concerning OEM support 

00x.018
- HTTP problems with some telecom providers fixed

00x.019
- SMS/IoT: 5 s wait time after amplitude limit reached first time to send highest amplitude

00x.020
- Bug in peak value holding for SMS/IoT fixed