You can access the LibreSDR firmware on GitHub here:
Order LibreSDR from Aliexpress:
Use the following settings for configuring your LibreSDR:
IP: 192.168.33.10
Username: root
Password: analog
fw_setenv ad936x_ext_refclk "<10000000>"
fw_setenv refclk_source external
fw_setenv xo_correction 10000000
fw_setenv ipaddr_eth "192.168.33.10"
pluto_reboot reset
Ensure all commands are entered correctly for proper configuration.