Following are a number of back-translations as well as a sample translation for translators of Isaiah 10:20:

• Kupsabiny: “A time will come when the remnant of Israel will not look (for help) towards the country of Assyria that persecuted them. But they shall trust in the God of Israel who is righteous.” (Source: Kupsabiny Back Translation)
• Newari: “On that day, the survivor Israel,
  the ones spared from the family of Jacob will also not put
  their trust in those who attack them.
  But as for the LORD, the Holy God of Israel,
  they will certainly trust [him].” (Source: Newari Back Translation)
• Hiligaynon: “A day will-come that surviving descendants of Israel, who was Jacob, will- no-longer -trust Asiria who caused- them -to-suffer, but to the LORD, the Holy God of Israel. They will-return to the Almighty God.” (Source: Hiligaynon Back Translation)