Hi, Apologize for the cross posting. I am running kernel 4.19.75 on iMX6 customized device with WiFi and 4G LTE, it was running well in an RW rootfs. After I have just changed rootfs to RO UBIFS partition, it failed RF Kill and postinsts I suspect both try write to the RO and failed, any advice how to fix it? Despite it failed RF Kill and postinsts, it was still working. [ 6.097762] UBIFS (ubi0:2): UBIFS: mounted UBI device 0, volume 2, name "rootfs-volume", R/O mode .............. [ 6.151932] VFS: Mounted root (ubifs filesystem) readonly on device 0:13. ................. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. Starting Load/Save RF Kill Switch Status... [FAILED] Failed to start Load/Save RF Kill Switch Status. See 'systemctl status systemd-rfkill.service' for details. [FAILED] Failed to start Run pending postinsts. See 'systemctl status run-postinsts.service' for details. ............... root# Thank you. Kind regards, - jh