I fear , we will be piling up programmer cards in the home / office, if we go on purchasing, the moment one doesn't work. Unless one is a serious professional programmer and his work suffers losses due to just a programmer, any one can scratch his head and look back at the programmer hardware or driver, we can settle things in a short time. added, we gain experience of servicing hardware.
Most common faults can be attributed to loose connections or power supply related. of course, the interconnecting cable should be below the critical length as it creates lot of confusions and we may wrongly interpret as hardware fault.
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