its czech.I can translate it (I'm from slovakia).I would do it sooner,but I have somehow missed this thread..here goes:
on this picture I have marked the SMD resistor right next to
switch voltage regulator on the card (LTC2909 if I'm not mistaken, its the one with many pins).
this resistor needs to be unsoldered and on those two contact fields that are left after the removal, you need to solder a cable with 2k resistor and potentiometer with value of 5k in serial connection.a precise xxx would be even better (here is where I fail miserably because I have no idea what part he means.xxx=
viceotackovy trimr,I think it should be an electronic part of some sort that allows for voltage regulation,probably by turnig some small wheel,
viceotackovy=something that can turn around,
trimr=
trimmer? guys skilled in electronics will probably know).
thats all. you set the voltage with the trimmer, the smaller the value, the higher the voltage.this config changes the voltage from default (3V) to approx. 4,2V.