can't help that much
take a look at this in the guide :
"
Your RedNAND SecureInfo_A MUST be the same as your SysNAND SecureInfo_A or you will BRICK. If you have changed your RedNAND region or otherwise modified SecureInfo_A in any way, you MUST create a NEW RedNAND or you will BRICK.
You MUST downgrade with the correct pack for your console region or you will BRICK.
If you are using ReiNand, you MUST be using the latest version (v4.1 or above) or you will be unable to downgrade NATIVE_FIRM on EmuNAND/RedNAND and PlaiSysUpdater will fail 100% of the time.
If you are using Luma3DS and DID NOT follow Part 3, you should copy the appropriatefirmware.bin from Part 3 to the /luma/ folder on your SD card, otherwise the downgrade will fail."