I have tested using the self-test tool, the board test failed:
[ TESTING STARTED ]
->Start time: Tue Feb 4 16:12:31 2020
->Device: LimeSDR Mini, media=USB 2, module=FT601, serial=1D4258EDA1A25F, index=0
Warning: USB3 not available
Serial Number: 1D4258EDA1A25F
[ Clock Network Test ]
->REF clock test
Test results: 4295; 17492; 30689 - PASSED
->VCTCXO test
Results : 6711060 (min); 6711213 (max) - PASSED
->Clock Network Test PASSED
[ FPGA EEPROM Test ]
->Read EEPROM
->Read data: 12 07 1B 12 07 1B 02
->FPGA EEPROM Test PASSED
[ LMS7002M Test ]
->Perform Registers Test
->External Reset line test
Reg 0x20: Write value 0xFFFD, Read value 0xFFFD
Reg 0x20: value after reset 0x0FFFF
->LMS7002M Test PASSED
[ RF Loopback Test ]
->Configure LMS
TuneVCO(CGEN) - failed to lock (cmphl!=0)
SetFrequencyCGEN(61.44 MHz) failed
TuneVCO(CGEN) - failed to lock (cmphl!=0)
SetFrequencyCGEN(122.88 MHz) failed
Failed to set sample rate
->RF Loopback Test FAILED
=> Board tests FAILED <=
Elapsed time: 2.45 seconds