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 I Have also upgrade to 1.7.0.0 , now I can not reach my admin/backoffice or website anymore. 

I had this error while updating.

[Ajax / Server Error for action upgradeDb] textStatus: "error " errorThrown:" " jqXHR: " 

Fatal error: Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.1.3". You are running 7.0.33. in /home/xandris/ww. xxxxx.be/vendor/composer/platform_check.php on line 24

{"nextQuickInfo":["[SKIP] directory \"\/app\/cache\/\" does not exist and cannot be emptied.","[CLEANING CACHE] File prod removed"],"nextErrors":["[INTERNAL] \/home\/xxxxx\/ww.xxxx.be\/vendor\/composer\/platform_check.php line 24 - Composer detected issues in your platform: Your Composer dependencies require a PHP version \">= 7.1.3\". You are running 7.0.33."],"error":true,"next":"error"}"

I had also  error on MOLLI, PAYMENT module ,  , i removed this module from  ftp , but no succes . 
 

for this moment site +, backoffice is 100 % offline 

‘this actions, also no succes , ( FULL RESTORE ) 

I Set php switcher on 7.3 php , and did a full restore , 

I set again php Switcher on 7.1 , again a full restore  , but no succes 

 I can only reach , cpanel or FTP , to see my files 

Is there a way to  remove the prestaschop installation , ( FTP ) then upload previous version 1.7.6.9 on ftp ?

or  must I  start from zero again , hopefully not ! 

thanks for advice and help ! 
regards Jean