Asus RT-N19(Also known as N600 or AC1200) supported but not loaded after kernel flash

Hello,
According to the documentation RT-N19 also known as
AC1200 or N600 is oficially supported by Open WRT at least since [23.05.4].
I flashed my defice via Asus Recovery tool (TFTP) with (openwrt-23.05.4-ramips-mt76x8-asus_rt-ac1200-initramfs-kernel.bin) but it is not loaded after flashing.
I followed the instruction https://openwrt.org/toh/asus/rt-ac1200

According to the Internet Asus RT-N19 is based on Qualcomm QCN5502 instead of original AC1200 which is based on MediaTek MT7628.
I also tried Open WRT for QNC5502 based devices like RT-AC56U,RT-AC57U,RT-AC58U (openwrt-ath79-generic-asus_rt-ac59u-squashfs-factory.bin) but it also failed to load after flashing
Any idea about Open WRT device support? Further steps to understand what is going wrong or which Open wrt builds to try?

It's not supported, trying images from other devices will eventually lead to a soft brick, at best.

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