Our NanoPC-T3 was flased with s5p6818-eflasher-20180416-friendly-core-arm64. The problem is booting is unstable since it some times boot until the linux prompt and several other freezes at this point, any hints? Starting udev Coldplug all Devices... [ 4.684000] mmc_host mmc1: Bus speed (slot 0) = 50...