Endless loop after replacement of lightning

After replacing lightning connector, battery , display and wifi modul the iphone is stuck in endless loop.

Restore through pc works fine, but afterwards the phone goes back to endless loop.

I had to change the front camera and display cable cause i damaged it at first. Also had to change the wifi modul cause i damaged that too.

What i tried:

Disconnecting battery and plugging iphone : still endless loop

Disconnecting lightning connector and startin phone with battery: still loop

What might go wrong:

Pins? I accidentally bent the lightning connector ones but gently nudged them back in the right shape.

Malfunctioning parts? I bought brand new from shop.

Any ideas what might i be able to do to fix this?