I am trying to install linux on my new Lenovo 5G

I am trying now for some time to install Linux on my new Lenovo 5G laptop as stand alone without success.

Laptop spec.:

Qualcomm Snapdragon 8cx Gen2 5G processor (Octa-Core)
8 GB LPDDR4X-1866
512 GB UFS 3.0
Adreno 680 Grafik shared VRAM

I tried the current version of:

Ubuntu arm server lts
Debian arm64
and some modified .iso i found on github and blogpost for the Lenovo C630.

Sometimes i can boot into the installation menu and get asked if i want to install, graphical install etc, after clicking on it, the laptop just reboots and the installation menu pops up again or he reboots in an endless loop.

With the .iso for the Lenovo C630 i had an partial success, at least i was able to go through the hole installation process, but after the reboot i get the error message that i need an windows recovery drive, I was partitioning everything in one during installation to have ubuntu as stand alone.

My thought was maybe the bootloader wasn’t installed properly, so i wanted to use a live usb stick with linux to boot into that one and install grub by hand. Unfortunatley i cant boot into the live versions of arm64 i found so far.