**root required
-
add your cert normally, it will be stored in your personal store and android will ask you a pin/password... Proceed
-
With a file manager with root capabilities, browse files in
/data/misc/user/0/cacerts-addedor/data/misc/keychain/cacerts-added. You should see a file here, it's the certificate you have added at step 1. -
Move this file to
system/etc/security/cacerts -
set the permissions for the file as
-rw-r--r-- -
Reboot the phone
-
You are now able to clear the pin/password you have set to unlock the device.