Update to 2.1.3 stucks at 80%

Hello,

I am trying desperately to update Akauting to 2.1.3, but when I click it the process stucks at 80% and then the site becomes inaccessible showing this error:

Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /home1/interl90/financeiro.*******.com/index.php on line 17

Parse error: syntax error, unexpected T_STRING in /home1/interl90/financeiro.*******.com/index.php on line 17

Then I have to manually change the PHP Version to 7.4 for it come back to normal (still 2.1.2)

Really use some help here, folks!
Thank you

please can you advise what you did to solve this issue because my update from 2.1.3 to 2.1.4 stuck at 80% then i restore back up from my cpanel now i want to update again but with cli command , i tried to run >>> php artisan update:all it start update then i got this error >> Not able to get the latest version of core! , appreciate to tell me what you did to solve this issue

I just changed the php version to 7.4 everytime I update Akaunting.