If you want OpenWrt, sell the Fast 5364 on eBay for $10 and buy an Xiaomi AX3200 or Asus RT-AC58U . You will save 10 hours of debugging.
This will void your warranty, likely break DSL, and may permanently brick the device if done incorrectly. Do not attempt without a USB-to-TTL serial adapter (3.3V) and recovery skills. sagemcom fast 5364 openwrt
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