Firmware V2.8 CA 6470-71-72, release 2017.10.25
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Check-sum when ET_V28.mot is read into the PROM-programmer = 0xA5EDE8

Firmware check-sum can be seen in the first line of the ET_V28.txt file:
120000000001805349F4EBFFFFFFFFFFFFFFFF
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Changes of v2.8:

- Clamp detection adjusted for clamps with longer cable (4m)
