LEDE on TP-Link Archer C50, but the install Instructions is in polish

Installing and Using OpenWrt
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I'd like to update my second post "TL;DR". So just to confirm, you:

  1. Downgraded original firmware using TFTP danghuy1994 firmware (ArcherC50v1_tp_recovery.bin)
  2. Then from the downgraded original firmware using standard firmware upgrade page, you used openwrt-ramips-mt7620-ArcherC50-squashfs-sysupgrade.bin
  3. Then from OpenWrt you used lede-17.01.1-ramips-mt7620-ArcherC50-squashfs-sysupgrade.bin