boot=UUID=0602-0454 disk=UUID=a7ecf32f-d897-4f8e-b760-03d219e31c88 quiet ssh
^ cmdline.txt normally looks like this, with both "boot" and "disk" using UUID identifier. I'm not sure why yours is using =label for the "disk" but it can be changed. The UUID will be unique to each .img.gz file that we release so ^ above is NOT something you can use, as it's for an image I've created that you don't have. You can find the UUIDs for your image using "blkid" command. It will look something like:
/dev/mmcblk0p1: SEC_TYPE="msdos" LABEL_FATBOOT="LIBREELEC" LABEL="LIBREELEC" UUID="0602-0454" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="a0ebf7ce-01"
/dev/mmcblk0p2: LABEL="STORAGE" UUID="a7ecf32f-d897-4f8e-b760-03d219e31c88" BLOCK_SIZE="1024" TYPE="ext4" PARTUUID="a0ebf7ce-02"
You can see that the /dev/mmcblk0p1 (partition 1) needs UUID=0602-0454 and /dev/mmcblk0p2 (partition 2) has a much longer UUID=
a7ecf32f-d897-4f8e-b760-03d219e31c88 .. and in cmdline.txt there is a space between the boot=UUID=<string> and disk=UUID=<string> sections.