Elcon/TC Charger Firmware: Facts

Minimal Discussion!
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Please direct all discussions to the Elcon/TC Charger Firmware: Discussion thread.
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Obsolescence Notice
This topic refers to the oldest range of Elcon/TC charger hardware, those manufactured with Elcon or TC branding prior to December 2013.
However, Elcon branded PFC models (not the UHF models) seem to retain the same basic design and processor chip.
From 2014 onwards, the TC branded HQ and later models use a different processor altogether
(a 32-bit ARM based processor, compared to an 8-bit 8051 based one).
As a result, this topic DOES NOT APPLY to the following models: UHF models, or TC branded PFC models manufactured 2014 or later.
As far as I know, no work has been done on the firmware for the models with the ARM based processor.​