L5 E610 - bricked - only fastboot - Secure booting error

Hello out there,

I get a used L5 for my little son, tryed to clear all data (factory reset) and it just partically worked, some data always survied.
I thougt, no prob, then I use recovery. when I tried to boot the recovery mode I saw the Message:

Secure booting error! Cause: boot certification verifiy

HM!

OK Lets try to install a custom recovery (first rooted with kingo, then install twrp 3 with dd)

Jet I only get the Message on booting nothing else is possible. fastboot is available.

Update the ROM with KDZ updater dosn`t work " No connection to phone"

I need *.img files that I can use with fastboot. I tryed to convert a kdz with two tools I found ( a python script and a tool developed for the G series) but that dosn`t work.

Is there a simple way to convert a ZIP to a IMG?

I tryed "fastboot boot recovery.img" and to flash it, but that also dosn`t work (orig. and TWRP)

I also get this:

Code:

---

C:\Users\mariu>fastboot erase userdata
erasing 'userdata'...
FAILED (status read failed (Too many links))
finished. total time: 2.489s

C:\Users\mariu>fastboot erase cache
erasing 'cache'...
FAILED (status read failed (Too many links))
finished. total time: 2.487s

---

THX for help

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