When flashing the eMMC content, the safe way is flash the eMMC/VANILLA image first, then remove battery for a moment, and then flash the FIASCO/Rootfs image. Do not boot up the device between the two i.e do NOT use the -R parameter at the end!

the recommended flash sequence then is rootfs, eMMC, rootfs *again*.
For users familiar with flashing and interested in a smooth fast process: you can flash combined first, and then *immediately* after that - without one 10th of a second of booting - directly continue with flashing the vanilla. The other way round doesn't work due to a bug in NOLO - so after flashing vanilla you need to remove battery to recover

Note that flashing eMMC will delete the /opt directory, so you *always* need to reflash your rootfs (the COMBINED image) after - or same time as - flashing eMMC (VANILLA img)