Secure partitions, signed binaries, etc

[p3y0t3]

So I have this tablet. Its marketed as a Sebbe S22, but in all actuality it is a Jusyea J10_EEA (tagged as: jusyea-skyth-s22-eea-j10-eea-ums312-2h10). I have a complete backup of its ROM etc, in "bin" format, via InfinityBox. On examination of the file contents, they appear the same as any other img file ive examined from the unisoc ums312 platform. I can flash some of the partitions with another tabs FDLs, but not teecfg, trustos, etc. How can I get around this or is it even possible? I know the answer to this is sitting right under my nose, but I refuse to see it. I'm guessing I could use the hackie resign method for the FDLs, but that would still require having the original FDLs anyways right? Being as the signature for the FDLs isn't in vbmeta....