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Steve Markgraf steve at steve-m.deHi, On 02.10.19 08:25, Fab Stz wrote: > When doing a setFrequency I usually have this error afterwards and the > frequency is actually not changed > > rtlsdr_demod_write_reg failed with -9 > r82xx_write: i2c wr failed=-9 reg=17 len=1 > r82xx_set_freq: failed=-9 This is weird, I haven't seen this issue before. Which USB host controller are you using, which OS and which version of libusb? -9 is LIBUSB_ERROR_PIPE, which means that the device probably sent a STALL, which again is very weird given that this issue never occured before for multiple users in the past. How often does this problem occur? Best Regards, Steve