And please if you have any opinion concerning that my friend with faulty device , it will be appreciated. Because I know there’s no way the other is going to get his back , and please try and learn from this so that you won’t make same mistake, losing your hard earn funds is not funny at all .
If the motherboard is bad beyond repairs, ask your repairer to extract the storage chip (eMMC) from the bad motherboard and look for a good card reader to extract the data ( if it's iPhone or higher version android phone) he would need a good specialist with forensic skills to decrypt the data because most advanced phones decrypt their Data for security reasons.
It's going to cost him some money but if those data/ coins are worth it why not.
Stop screenshoting your backups, it takes less than 50 seconds to write and less than 60 secs to find a safe location.