What is the best solution for recover data from dead iPhone and no backup?

Hi,

My iPhone won't turn on n charge. I search on google and read more than 200 article and try all the way but didn't turn on iPhone. I can connect to the iPhone in DFU mode and iTunes has detected an iPhone in recovery mode. Popup the message You must restore this iPhone before it can be used with iTunes.

If I click on this, it warns me that factory settings will be restored and that data will be lost. I don't want to lose my data. I didn't have backup.

I go to apple showroom the guy told me have hardware problem.

If i restore the iPhone in recovery mode not sure can be restored successfully without any problems and iPhone turn on but the apple guy told me is hardware problem if hardware problem then how to restore iPhone in recover mode?

I take the iPhone to other shops after they checking the iPhone all they say can't repair. some say CPU or motherboard or logic board problem.

Let's start discussion.

Option

1. I saw on video some expert people can take out very easy memory chip from iPhone.

Question :

A. After take out the memory chip from my iPhone can possible backup to my computer?

B. Can backup to my account iCloud Drive?

C. They can restore my data to new iPhone?

D. Is possible without take it out memory chip from logic board can backup to my computer or iCloud Drive ?

2. Buy second hand iPhone then ask them take it out my iPhone memory chip and put in second hand phone.

Question: After they change the memory chip then second phone show all the apps and my data? If iPhone work this way then also can backup on iCloud Drive?

3. If have Logic Board problem then i change the logic board then my data memory chip put on my logic board.

Questions:

A. Where i can buy Logic Board iPhone 6 plus 64 Gb ?

B. iPhone show all the apps and my data ?

C. Can backup to my iCloud Drive ?

Someone saying: he pointed out that it's a small ic chip on the logic board are common to blow on these and will stop ur iPhone from powering on or even charging he did the repair today and walla it's back working I honestly thought the phone had it but 100% this is the issue its caused by overcharging.

Questions: Which ic chip on the logic board?

I download many account apps where i save the data because that apps didn’t have backup service. I have get back data.

If any other option available please share here to help other.

I already spend 15 days on searching and read article and wasting my time. Hope soon can find the way to recover the data.

Thanks very much