Hi,
There is no MySQL version 5.4.x both as a Wampserver addon and at MySQL, where did you get this version?
> I have changed the mysql version in .init
There is no file with the extension .init, you probably mean the file wampmanager.ini
; ** There is no point in modifying the file wampmanager.ini ***
; * The wampmanager.ini file is completely rewritten each time *
; * Wampserver is launched and each time a Wampserver, Apache, *
; * PHP, MySQL or MariaDB option is modified.
To change MySQL version, it is necessary to use:
Left-click -> MySQL -> Version -> choose the desired version
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons