pull out my old MXQ 805 201d 512MB ram and try Armbian on it. 3.10.108 work fine for me until I put swap file to NAND and box heavily put data in/out swap ==> CPU soft reset. OK, next I try with image 20.9.buster_5.9rc no more NAND to test so but when I connect to serial port over usb start lock up ( after 30s ). If I terminate the serial over USB connection before blackout things back normal. Pretty sure problem related to kernel or hardware description/driver but not sure where to start.