Teslacreiste

Alexis - this looks to be like a "normal" (non-LTS) board. I think your CPU temperature really is around 73 degrees, which sounds normal to me for 100% load on 4 cores.
 
For me, on the LTS board, in the same scenario, I get a reading around 40000 (i.e. 40 degrees C). Unless I've misunderstood, I think an offset is (at least roughly) enough.

So in the end is there a fix for this or not except using the image from Xunlong instead of Armbian? Thank you!

spi0 { pins = "PC0", "PC1", "PC2", "PC3"; function = "spio0"; linux, phandle = <0x20>; phandle = <0x20>; }; spi1 { pins = "PA15", "PA16", "PA14", "PA13"; function = "spi1"; linux, phandle = <0x21>; phandle = <0x21>; }; spi@01c68000 { compatible = "allwinner, sun8i-h3-spi"; reg = <0x1c68000 0x1000>; interrupts = <0x0 0x41 0x4>; clocks = <0x6 0x1e 0x6 0x52>; clock-names = "ahb", "mod"; dmas = <0x1f 0x17 0x1f 0x17>; dma-names = "default"; pinctrl-names = "default"; pinctrl-0 = <0x20>; resets = <0x6 0xf>; status = "disabled"; #address-cells = 0x1; #size-cells = 0x0; linux,phandle = <0x5c>; phandle = <0x5c>; flash@0 { #address-cells = <0x1>; #size-cells = <0x1>; compatible = "mxicy, mx25l1606e", "winbond, w25q1$ reg = <0x0>; spi-max-frequency = <0x2625a00>; }; }; spi@01c69000 { compatible = "allwinner, sun8i-h3-spi"; reg = <0x1c69000 0x1000>; interrupts = <0x0 0x42 0x4>; clocks = <0x6 0x1f 0x6 0x53>; clock-names = "ahb", "mod"; dmas = <0x1f 0x18 0x6 0x53>; dma-names = "rx", "tx"; pinctrl-names = "default"; pinctrl-0 = <0x21>; resets = <0x6 0x10>; status = "disabled"; #address-cells = <0x1>; #size-cells = <0x0>; linux, phandle = <0x5d>; phandle = <0x5d>; }; spi0_pins = "/soc/pinctrl@01c20800/spi0"; spi1_pins = "/soc/pinctrl@01c20800/spi1"; spi0 = "/soc/spi@01c68000"; spi1 = "/soc/spi@01c69000"; I use debian server mainline kernel. So there is dts instead of fex.
Here is what I found in dts.
What is the magic string that will invert CS default state?