ch mod permissions after upgrade to 1.31 ( help please)

[makaraci]

hi fellas

Chmod permissions of my alll folders in the ftp is recursively 755 for folders and 644 for files.Is it ok or should i change somethings ?

Detailed information :

I set chmod permissions like this ( just like wiki) :

1 ) 755 to (not recursively)

/config,
/upload
/download

2 ) 755 to (recursively)

/img
/mails
/modules
/tools
/themes/prestashop/lang
/translations

(Every single folder and and file has 755 ch mod inthese folders)

Questions :

1 ) Should i change permissions after upgrade or are they corrected ?

2 ) What is correct ch mod permissions for other folders and files in the ftp such as

/admin (it is 755 recursively right now) ,(files of admin folder is 644),
/classes (it is 755 right now)
/css (it is 755)
/docs (it is 755)
/js (it is 755 recursively)
/themes ( it is 755 recursively)
/tools ( it is 755 recursively)
/translations ( it is 755 recursively)


Any help would be appreciated !

Thanks in advance

Best regards