Can't access Razer Phone 1 Bootloader

UltraBlack_

Member
Oct 27, 2019
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Hello there,
I just bought a Razer Phone (1), and decided to install LineageOS on it. So I downloaded the system image, and tried to install it with TWRP, but twrp always failed to install Lineage. Then tried to install it with the Lineage recovery update-installer-tool. That worked very well, but after trying to install the addonsu, my Lineage told me, it was broken. Then I tried it again, but I only was able to use the broken-Lineage-recovery with following options: Try again and Factory reset. Both didn't work in any way. After tying to boot into the bootloader manually, only the white battery symbol showed up. As I read somewhere in the web, this symbol means, that the cable is somehow not the right one, but also, another cable and a battery emptying didn't work.
So I'm here: With a kinda bricked phone and no clue what to do.
I need help at this,
thanks in advance.