Samsung Galaxy s4 mini gt-i9192 does not turn on how to fix?

Question

Android

Hello connoisseurs!) In general, they brought this device, they said they put it on charge for the night and in the morning when it was turned on, the initial record of the Samsung galaxy mini hangs and does not boot further, I wanted to make a hard reset but did not enter the recovery, it wrote the booting recovery and everything went out the screen and with a new attempt the same. And I decided to flash it, downloaded the firmware, the phone flashed normally and immediately rebooted, the inscription Samsung Galaxy s4 mini gt-i9192 appears and on top
RECOVERY BOOTING....
Set Warranty Bit: recovry
And so it’s worth it not to boot further ... I hold both volume keys and the on button (or I pull out the battery) and immediately the ODIN software download mode enters and it says in red on top:
Coul not do normal boot.
I downloaded the service multi-file firmware, but there is an error (Maybe the file is broken, the bootloader and the firmware itself are not sewn, the modem pit file and csc are being sewn) the first firmware is also sewn without problems and again the boot mode exits and does not boot further, it is also not included in the recovery , I flashed another bootloader and recovery, it’s still the same, so I decided to download another multi-file firmware, but then the thought crept in, is the phone’s flash memory in order, maybe it was covered because when it was brought, he didn’t enter the recovery right away? what do you advise? is it worth downloading other firmware or how to check the flash memory for performance
?
PS I just heard that this behavior may be the result of a flash memory failure, but I just don’t know how to check it, the service is 300 km away, so this is an extreme case.