Samsung J2 Pro app update boot-loop, need contacts

[TThompson]

So, trying to help out a mate whose phone started to optimise apps and hit "63 of 63" before rebooting. It complains about a missing file/directory, though the friend says nothing was done by him other than turning it on. I charged it overnight and then tried the old "wipe cache" from the recovery menu, but still stuck. I thought maybe I could browse the system using Samsung software or a variant of Linux, but nothing sees it.

Is it cactus? Was just really after the contacts.

Cheers

 

[ocnbrze]

what phone is this?

 

[TThompson]

what phone is this?

Samsung J2 Pro, as in the title​