Hi,
Thanks for the message.
Finally I had been able to rebuilt armbian like it was end of December twisting the vagrant files and forcing a tag for the kernel 4.19 (presently the branch 4.19.y doesn't built at all).
Right now I cannot test if the last fixes about pine64so (https://github.com/janwillies/u-boot/commits/v2019.01-sopine-spi) merged by ... you works for pine64-lts boards.
If it seems to not work I will open a dedicated thread.
Thank again for the support.
Best regards