iPhone Stuck in Bootloop after replacing screen

Hi,

I recently replaced the screen of My iPhone 11 Pro using an iFixit replacement Kit.

After putting the phone back together it worked for a few minutes and then turned off and the Apple Logo was Flashing slowly

I tried to put it into recovery mode but that didn't work either.

I also Tried reseating all the connectors but nothing.

Now i don't know what to do and i also forgot to take a backup of the files before repairing

I am Thankful for any answers