Apple Logo Looping in iphone X after several trials and problems with Quick Start to sync to new iphone 12 pro

update: i contacted apple support where the steps mentioned in the FAQs were repeated and confirmed that were followed. I was them prompted to go to Genius Bar where they should be able to help me further. I went there, to have the person there reading from a screen "error 4013....yep, hardware error, nothing to do. This has nothing to do with the fact this happened after all the problems with the data transfer to your new phone, and absolutely a coincidence that this happened right after you transferred the data to your new iphone. No way this could be linked, because error 4013 is a hardware error, and data transfer is a software issue. Ah, i see the back of your phone which is out of glass is broken here, so the electronics must have been "fragilized" (any engineers out there ?!) and when you did the data transfer it affected the hardware (which 1´before was mentioned that was irrelevant to the software). we cannot repair your phone because it is out of guarantee, but we can offer to replace it with a used iphone X which will cost you 500CHF without VAT -but of course you can buy a new SE or similar model which is cheaper. So sorry we couldnt help you, but we fully understand how you feel and agree this is not helpful".

Anyone had such an incident happen to them? Old iphone die after troubles with data transfer to a new one (my new one is an iphone 12pro). Also, is this normal that the "after sales services" includes only pointing out to FAQ steps and then prompting you to buy a new phone? I have been a great customer to date as i never needed an Apple support and have all kind of gadgets etc, but the minute something actually happens it sounds like you are on your own (or thankfully together with other fellow users like you). My telephone was reliably working until the minute i tried to transfer the data - i then updated to ios 14.4, did the data transfer and boom, was dead. Looking for other fellow users with similar cases, because I cannot feel i am treated like a little ignorant and be told things that are obviously ridiculous, let alone contradictory.

Thank you @Ingo1127. I tried all this, but it wont work. For the space issue, i resolved it by adding to my old phone lots of data to allow the photo optimization to be implemented. Now the iPhone 12 pro works fine, the storage is around 30Gb but my new problem is the looping apple logo. Data is not an issue as for the migration it is on the cloud - and on the new phone, the problem was the mention 1% icloud photos which i resolved by restoring to factory settings (after having removed the "find my phone") from icloud.

My iphone X is dead despite all efforts to restore to factory settings - i keep getting when i use volume up, volume down and right button the link to restore. Once I do so, I get several unknown error messages which i looked up but without a solution. I am convinced something got messed up with all the synchronization with the new phone (because the timing thi shappened is quite weird). One of the recommendations is now to try with another computer (!). Have only windows computers, and i just installed icloud, i.e. I have the latest version, similar to the latest iOS versions (which may also be linked to the problem?) Any advise most welcome, this is beyond frustrating!!

Dear Ingo1127, i get directly the "support.apple.com/iphone/restore link. I got 4013 error message - it is resetting issue on the iphone X. Yes, original USB-C cable/output used from the iphone 12 pro that i used in the iphone X - and even used the USB-A original cable from iphone X.