iPhone 6 - Does not catch range, no network at all, scorched chip on the disc

Hello, I bought IP 6 after a fall, the casing on the back at the top has dents and is bent backwards, so the display crashed at the top, the sim card reads, how to remove it is info with no, but the range does not catch at all, only moments looking and then the lack of a network, I took off the display and I see a system burned somewhere, somewhere I saw the same problem, and someone has just soldered it out, it is in my case and if the service would expensive for it? Pictures in the attachment

Can anyone help? I also noticed that after typing on the keyboard * # 06 # does not display imei, just nothing happens, what can it be? Now after unscrewing and straightening a little of this case and re-twisting using all the screws (there were only 3 ..) it is looking for the network all the time, there is no lack just looking for it, in the settings my sim is unknown

This is not a burned system, only a fried plate when downloading the bottom screen so no one will tell you what is 100% damaged.
Generally, the problem with the range and lack of imei after entering the code is a classic in this model. You have to take off the baseband and map two connections below it.

Okey, thanks, and you know how much fun such a service should cost? Is it worth it?

The cost is about PLN 400. Just like a colleague wrote, you have to do what in the picture below:



Greetings
GSM service

Chmm, that's how much I gave for this phone, so it's an average profitability, or is it really a must? I read a similar topic on the electrode, all the same as with me and they wrote that this is not it, one wrote to replace the bottom charging port and headphone because there is also an antenna, because in my settings normally shows everything, imei etc, only after entering the code it's gone

Added after 2 [minutes]:

https://www.elektroda.pl/rtvforum/topic3326087.html This is the topic, the same symptoms as in my case.