This should be how to create a boot.img.
https://github.com/KonstaT/sailfisho...oot-img.sh#L17

Looks like there's only a dummy ramdisk inside boot.img. Have you btw dumped the original boot partition from the device? Or at least could someone upload the kernel config (/proc/config.gz) from an actual device? It should be quite close to boston_mer_defconfig but still not exactly.

According to this, there's also a tool for flashing partitions in the system.
https://github.com/KonstaT/sailfisho...bootimg-sbj.sh

Edit. Oh wow, my posts are moderated before publishing for some reason. This message appearead here several days (~week?) later. Seriously, wtf?! If I've done something to deserve a post ban - then just issue one, but this is just ridiculous.