Uninstall

[Drifti]

Uninstallation of Version 9.2.1 in Magento 1.9.3.7 before Update: (worked for me).
In admin:
First, deactivated in system>userdefined grids>list, show 100, mark all (77 grids in my case), deactivate,
logout, login, renew cache
Second, delete in system>userdefined grids>list, show 100, mark all (77 grids in my case), delete,
logout, login, renew cache,
logout
In mySQL: delete all rows in all 8 tables starting with customgrid_
In mySQL: delete (DROP) with deactivated "check of FOREIGN KEY" all 8 tables (9 tables in WIP Version) starting with customgrid_
In mySQL: delete the customgrid_setup row in the table core_resource
In filesystem: delete all parts of the extension, thats all folder called "BL" or "bl" and the file "BL_CustomGrid.xml"
In filesystem: delete all in var/cache
In filesystem: delete all in var/session
Ready.