Originally Posted by Cyberskunk
Because OFW does not have the spkg_hdr.1 signature check patched.. If it did it would be CFW..
If you modify the CORE_OS_PACKAGE.pkg then you need to make a new CORE_OS_PACKAGE.pkg.spkg_hdr.1 to match your new pkg.
Now since we DO NOT have the private key to sign the spkg_hdr.1 file it will ALWAYS fail on OFW firmware 3.56+
Straight from the horses mouth. Lets see if this wisdom you have shared will slow down the noob questions.