@borgiatos
Your files are for Nvidia card, not going to work for PaintArm, I think his system is running on HD 4600.
@PaintArm
Replace the attached contents into /EFI/Clover
Remove VoodooHDA.kext and AppleHDADisabler.kext
No need for the DP to HDMI converter. DP to DP is fine, you should be able to get audio through your DP connected monitor.
You can upgrade directly from Sierra to High Sierra like a real Mac. No need to create new installer.
High Sierra has new APFS format and will convert automatically if you have SSD drive. If you want to keep HFS+ format, see here for terminal command to install without converting (under Upgrading to High Sierra ...).
Prior to upgrading, make sure to check if you have CoreStorage (virtual drive). Revert if you do before upgrading.
See here under Core Storage for info
3020_HS.zip