[XT1086] TWRP recovery fails to flash new ROM

So, after wiping cm12.1 system,data and cache files (dalvik too), I tried to flash the cm 13.0 nightly i download from the cm website. All went well until it crashed halfway during the flashing and reboot into the "Unlocked bootloader" warning screen. No animated logo appeared. Pressing power + volume down did reboot it into TWRP again, and this time i tried to restore the nandroid backup I made earlier. It reached about 240 megabytes of restoring only to crash and reboot into unlocked bootloader message again. I do not know what to do now, as i have little experience beyond the most basic things of flashing ROMS et cetera. Also I tried to use the ADB bridge to flash the cm13 zip, but oem devices just shows my phone as unauthorized and when using the commands given at cm wiki it just says <waiting for device>. I suspect this being due to the fact ther no longer is an OS installed?

Thanks for the help,

Julz_

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