Hey Diego. The libs are the main part of this that makes it work. The black screen issue was fixed by Abraham GC and the lib he added was mentioned but you need to source 32bit ones. (All of these libs can probably be taken from S7 oreo) however VOLD binary is 64bit. You could try and look for 7870 tablets that had private mode and recived oreo (T585 Maybe) and try it's vold.
I have never attempted this fix on any 32bit device I had due to this issue. Wish you good luck maybe you can find the needed set of libs
I kinda figured the VOLD stuff was going to be 64bit
I may have to do the whole 64bit thing on Oreo like Astrako did on Pie, but that's on the extreme case I really want this to work xD (not to mention it is probably a huge task to somebody with not that much experience)
I'll look into what you mentioned regarding the T585, it may be the only way.
Wish me luck!