Device shows up only on DFU Mode, and only shows a black screen

My cousin's iPhone after a long day at her job her iPhone started turning off every few minutes and after one hour of that happening, her screen became black, no Apple logo. When i force restart the phone, i can hear the vibrations but there is no display on the screen, When i plugged it in into my computer, it didn't show anything i tried recovery mode, didn't work, and that's when i entered into DFU Mode, the iPhone showed up and when i went to flash the firmware, it gave me an error code 4013, then i went to use 3rd Party Software to try to flash it, it got at 11% and in the flashing process it said "Unable to switch DFU mode to recovery mode. The software also included something called "Fix Flash" which i used around 10 times and it also kept on getting to 11% which it also said "Unable to switch DFU mode to recovery mode" and i found that you could see more things in the program and this is what showed up.

11:57:44.283:  LibVersion: 20231009

11:57:44.283:  Start flash

11:57:44.283:  Checking PC DiskSpace

11:57:44.283:  Detecting Connection

11:57:44.287:  Found a device with mode: DFU

11:57:44.287:  Detecting ProductType

11:57:44.287:  matching device type through original information

11:57:44.290:  Checking iDevice firmware C:\3uToolsV3\Firmware\iPhone12,1_17.5.1_21F90_Restore.ipsw

11:57:44.290:  Extract BuildManifest.plist

11:57:44.290:  Extracting Restore.plist from IPSW

11:57:44.332:  Firmware version: 17.5.1

11:57:44.332:  Product Build: 21F90 Major: 21

11:57:44.334:  Is Image4 supported: TRUE

11:57:44.334:  Extracting Firmware

11:57:44.351:  Reading ECID

11:57:44.353:  Found ECID --------------

11:57:44.353:  Reading NONCE

11:57:44.353:  Requesting SHSH

11:57:45.017:  Enter Recovery Mode

11:58:06.474:  ERROR: Unable to connect to device in DFU mode

11:58:06.474:  ERROR: Unable to get ApNonce from device!

11:58:06.485:  ERROR: Unable to switch DFU Mode to Recovery Mode.

11:58:06.474:  Please contact us while failed to fixed 1110 issue.

I don't know what else to do.