hello yukim8b8t,
did you always install via SDKManager?
could you please have alternative way to flash the board, the same OS image should store as below.
/home/adstec/nvidia/nvidia_sdk/JetPack_4.2.3_Linux_GA_P2888/Linux_for_Tegra/
please generate system image locally without flashing the board in the beginning.
$ sudo ./flash.sh --no-flash jetson-xavier mmcblk0p1
once complete, put your device enter forced-recovery mode and adding -r options to reuse the image to flash the board.
$ sudo ./flash.sh -r jetson-xavier mmcblk0p1