pycage:

Did you untar the rootf with jxvf or -jxvf, for me only -jxvf was able to untar booting system.
My n810 never boots to android if ext-card is inserted, so try removing it.
Don't worry about bootloaders, solcas kernel overrides them.

@Solca:

My tablet still turns itself off automatically, maybe it poweroffs because of the automatical search for wifi networks? btw, with latest rootfs and kernel, it is still unable to scan for wifis, userspace crashes and robot splash comes up... logcat