[Help] Fix Secure Boot Error

Hello,

today I wanted to install cm on my LG G2 D802 (international version, Germany) with 16GB

I updated kitkat to the latest version via OTA:

Android Version: 4.4.2
Buildnummer: KOT49I.D80220d
Software Version: D80200d-262-02

I rooted the phone with the latest ioroot tool from xda
After that I tried AutoRec to install TWRP but I was stuck at "Checking for loki... installing"
Then I flashed TWRP (2.7 and 2.6.3) with the APP flashify.

Now everytime I try to boot into recovery I get the error:
Secure Booting Error
I can normaly boot up the device and only the recovery is broken.


What can I do to install TWRP?
Or how do I revert the current recovery to a stock recovery?

Thanks

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