https://www.securitylab.ru/blog/personal/SimlpeHacker/354091.php Смотрим архитектуру SoC роутера:

uname -m

mips = big-endian MIPS
mipsel = little-endian MIPS (often called mips32le)
armv7l, aarch64, etc. = ARM
x86_64 = 64-bit PC

cat /proc/cpuinfo | grep isa

Ну и дальше ставим:

#!/bin/sh
set -e
ARCH='mips32'
XRAY_VERSION='v25.8.3'
WRK_DIR='/tmp/xray'

apk update
apk add luci-compat luci-lib-ip bsdtar
rm -Rf ${WRK_DIR}
mkdir ${WRK_DIR}
curl -L  https://github.com/XTLS/Xray-core/releases/download/${XRAY_VERSION}/Xray-linux-${ARCH}.zip | bsdtar -xf - -C ${WRK_DIR}/
chmod +x ${WRK_DIR}/xray
ln -s ${WRK_DIR}/xray /usr/bin/xray

#/etc/xray/config.json

Подробнее: https://www.securitylab.ru/blog/personal/SimlpeHacker/354091.php