The Radxa Rock 5T in Armbian is maintained by @meco, maybe he will have something to say.
I don't have the board, so I will only be of limited help. Have you tried some of the commands given in the thread you linked and what was the result? Can you confirm that your modem shows up for a second and then disappears? Can you compile your own image with a vendor kernel?
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just need a copy of the ARM BOARD and a x86 computer to compile new versions.
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Product Specification:
Chipset: Rockchip RK3576 Octa Core ARM Mali G52 MC3
WIFI: WiFi6 11ax 1x1 80 MHz
wifi controller: AP6275P
RAM: DDR4 4GB/8GB
ROM: eMMC 32GB/64GB/128GB
OS: Android 14.0 || Armbian Vendor 6.1
Ethernet: 1000M Standard RJ-45
Bluetooth: BT 5.0
The RK3576 is indeed a lower-cost SoC but features four Cortex-A72 and four Cortex-A53 cores instead
Android Base Files:
H96-RK3576-ANDROID.dts
H96-RK3576-ANDROID.dts
H96-RK3576-BOX.dtb
H96-RK3576-BOX.dtb
RK3576_MiniLoaderAll.bin
Factory Firmware for H96 Max M9
https://disk.yandex.ru/d/pWGEtRel0P9ejg
https://drive.google.com/drive/folders/1g63F8fGSLEA9iK2_Mqzd6F0xfaTRnGlm?usp=sharing
Factory Firmware for H96 Max M9S
https://disk.yandex.ru/d/H17eGTYCjgmCsg
https://drive.google.com/drive/folders/1Q360l5XbTVsWIvWkqy2xJ0sLpqHRSApM?usp=sharing