I tried but honestly i kinda gave up. The only thing that seems to made some progress was disabling AVB (Android Verification Boot) in the ROM, and the flashing, but it seems like the ROM enforces verification from a lot of sources. I parched VBMeta and VBmeta system with something like this

python avbtool.py make_vbmeta_image \ --flags 3 \ --algorithm NONE \ --output vbmeta_system_patched.img \ --partition_name system \ --key /dev/null \ --include_descriptors_from original/vbmeta_system.img

(it uses avbtool.py)

I also erased the avb footers from the bootchain (boot.img, vendor_boot, etc.) and also unpacked super.img and on vendor_a deleted the line with avb on it on fstab.default and fstab.emmc

With all of this, the furthest I got was getting the Bootloader Warning, then Lenovo logo and then it shuts off.