[TYPO3-project-4-3] Loocked out from BE after update!

[Steffen Kamper]

Hi,

i'm pretty sure that it's an extension that isn't compatible.

So comment out complete $TYPO3_CONF_VARS['EXT']['extList'], delete all 
temp_CACHED... files and try again.
Concentrate on extension that change login.

loginSecurityLevel should be superchallenged for most cases. normal is 
used only for rsa iirc, and challenged isn't used at all.

vg Steffen