cp2102 (betemcu, B75937)

[lonelysurfer]

...a never ending story: 
i have a working ftdi-ttl, but the cp2102-adapters 
(http://www.ebay.de/itm/USB-2-0-to-UART-TTL-6PIN-Module-Serial-Converter-CP2102-/370532286388?pt=PCC_Drives_Storage_Internal&hash=item564571ffb4) 
with the same cable dont work under ubuntu or windows. 
if i rub the top of the 2.55mm with my finger random data appears. but the
loader doesnt upload the firmware. 
i used the txd, rxd and gnd pins and checked the connections with a
multimeter. 
i tested -m c123xor, -m c123 and the default firmware. flashing custom
baudrates was no problem. 
rivers are installed correctly (stady ttyusb0 under ubuntu/ com1 under win).
is there any hint? 

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