Phone Wont Boot After Replacing Digitizer

Hello, i recently ordered a new digitizer & lcd for my phone but the phone stucks on samsung core 2 logo when i turn it on.

I figured out that the problem is the digitizer and not the lcd since the new lcd boots with the old digitizer.

BUT if i turn on the phone with the old parts and replace the lcd+digitizer while the phone is turned on, everything works perfect until you turn off the phone again and it stucks at logo again.

So, i assume that there is a code in the firmware that doesnt let the phone boot with thirdparty replacements. If i am correct, will a custom firmware solve my problem? Or, is there any other solution?