The reason some some chargers do not work is that in case of SONY-Readers (at least x50-series) two of the 4 cables soldered to the USB-plug have to be short-connected.
That's not the case in every charger even when the form-factor (micro-USB) is given. In those cases you can plug it in but the reader will refuse to switch to cahrging-mode.
A.
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